Revert http-pretty it seems few tests becomes flaky.

requirements/constraints.txt

@@ -114,3 +114,7 @@ edx-bulk-grades<0.8.5
 
 # python3-saml==1.10.0 version started breaking a11y tests
 python3-saml<1.10.0
+
+# With greater version these tests `common.djangoapps.terrain.stubs.tests` becomes flaky on jenkins.
+httpretty<1.0
+

requirements/edx-sandbox/py35.txt

@@ -20,7 +20,7 @@ matplotlib==2.2.4         # via -c requirements/edx-sandbox/../constraints.txt,
 mpmath==1.2.1             # via sympy
 networkx==2.2             # via -r requirements/edx-sandbox/py35.in
 nltk==3.5                 # via -r requirements/edx-sandbox/shared.txt, chem
-numpy==1.16.5             # via -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc, scipy
+numpy==1.16.5             # via -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc
 openedx-calc==1.0.9       # via -r requirements/edx-sandbox/py35.in
 pycparser==2.20           # via -r requirements/edx-sandbox/shared.txt, cffi
 pyparsing==2.2.0          # via -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc

requirements/edx/development.txt

@@ -149,7 +149,7 @@ glob2==0.7                # via -r requirements/edx/testing.txt
 gunicorn==20.0.4          # via -r requirements/edx/testing.txt
 help-tokens==2.0.0        # via -r requirements/edx/testing.txt
 html5lib==1.1             # via -r requirements/edx/testing.txt, ora2
-httpretty==1.0.5          # via -r requirements/edx/testing.txt
+httpretty==0.9.7          # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.txt
 icalendar==4.0.7          # via -r requirements/edx/testing.txt
 idna==2.10                # via -r requirements/edx/testing.txt, requests
 imagesize==1.2.0          # via sphinx
@@ -267,7 +267,7 @@ semantic-version==2.8.5   # via -r requirements/edx/testing.txt, edx-drf-extensi
 shapely==1.7.1            # via -r requirements/edx/testing.txt
 simplejson==3.17.2        # via -r requirements/edx/testing.txt, sailthru-client, super-csv, xblock-utils
 singledispatch==3.6.1     # via -r requirements/edx/testing.txt
-six==1.15.0               # via -r requirements/edx/pip-tools.txt, -r requirements/edx/testing.txt, analytics-python, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-rbac, edx-sphinx-theme, event-tracking, freezegun, fs, fs-s3fs, html5lib, isodate, jsonschema, libsass, mock, paver, pip-tools, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, sphinxcontrib-httpdomain, stevedore, tox, transifex-client, virtualenv, xblock
+six==1.15.0               # via -r requirements/edx/pip-tools.txt, -r requirements/edx/testing.txt, analytics-python, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-rbac, edx-sphinx-theme, event-tracking, freezegun, fs, fs-s3fs, html5lib, httpretty, isodate, jsonschema, libsass, paver, pip-tools, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, sphinxcontrib-httpdomain, stevedore, tox, transifex-client, virtualenv, xblock
 slumber==0.7.1            # via -r requirements/edx/testing.txt, edx-bulk-grades, edx-enterprise, edx-rest-api-client
 smmap==3.0.5              # via -r requirements/edx/testing.txt, gitdb
 snowballstemmer==2.1.0    # via sphinx

requirements/edx/testing.txt

@@ -145,7 +145,7 @@ glob2==0.7                # via -r requirements/edx/base.txt
 gunicorn==20.0.4          # via -r requirements/edx/base.txt
 help-tokens==2.0.0        # via -r requirements/edx/base.txt
 html5lib==1.1             # via -r requirements/edx/base.txt, ora2
-httpretty==1.0.5          # via -r requirements/edx/testing.in
+httpretty==0.9.7          # via -c requirements/edx/../constraints.txt, -r requirements/edx/testing.in
 icalendar==4.0.7          # via -r requirements/edx/base.txt
 idna==2.10                # via -r requirements/edx/base.txt, requests
 importlib-metadata==1.7.0  # via -c requirements/edx/../constraints.txt, -r requirements/edx/coverage.txt, inflect
@@ -256,7 +256,7 @@ semantic-version==2.8.5   # via -r requirements/edx/base.txt, edx-drf-extensions
 shapely==1.7.1            # via -r requirements/edx/base.txt
 simplejson==3.17.2        # via -r requirements/edx/base.txt, sailthru-client, super-csv, xblock-utils
 singledispatch==3.6.1     # via -r requirements/edx/testing.in
-six==1.15.0               # via -r requirements/edx/base.txt, analytics-python, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-rbac, event-tracking, freezegun, fs, fs-s3fs, html5lib, isodate, libsass, mock, paver, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, stevedore, tox, transifex-client, virtualenv, xblock
+six==1.15.0               # via -r requirements/edx/base.txt, analytics-python, bleach, bok-choy, chem, codejail, crowdsourcehinter-xblock, cryptography, django-countries, django-simple-history, edx-ace, edx-bulk-grades, edx-ccx-keys, edx-django-release-util, edx-drf-extensions, edx-enterprise, edx-i18n-tools, edx-lint, edx-milestones, edx-rbac, event-tracking, freezegun, fs, fs-s3fs, html5lib, httpretty, isodate, libsass, paver, pycontracts, pyjwkest, python-dateutil, python-memcached, python-swiftclient, singledispatch, social-auth-app-django, social-auth-core, stevedore, tox, transifex-client, virtualenv, xblock
 slumber==0.7.1            # via -r requirements/edx/base.txt, edx-bulk-grades, edx-enterprise, edx-rest-api-client
 smmap==3.0.5              # via gitdb
 social-auth-app-django==4.0.0  # via -r requirements/edx/base.txt