Register ProctoredExam model for django admin

This will help us flip mysterious cases where proctored exams are
marked inactive.

JIRA:MST-609

requirements/edx/base.txt

@@ -105,7 +105,7 @@ edx-milestones==0.3.0     # via -r requirements/edx/base.in
 edx-opaque-keys[django]==2.1.1  # via -r requirements/edx/paver.txt, edx-bulk-grades, edx-ccx-keys, edx-completion, edx-drf-extensions, edx-enterprise, edx-milestones, edx-organizations, edx-proctoring, edx-user-state-client, edx-when, lti-consumer-xblock, xmodule
 edx-organizations==6.7.1  # via -r requirements/edx/base.in
 edx-proctoring-proctortrack==1.0.5  # via -r requirements/edx/base.in
-edx-proctoring==2.5.10    # via -r requirements/edx/base.in, edx-proctoring-proctortrack
+edx-proctoring==2.5.11    # via -r requirements/edx/base.in, edx-proctoring-proctortrack
 edx-rbac==1.3.4           # via edx-enterprise
 edx-rest-api-client==5.3.0  # via -r requirements/edx/base.in, edx-enterprise, edx-proctoring
 edx-search==2.0.1         # via -r requirements/edx/base.in

requirements/edx/development.txt

@@ -117,7 +117,7 @@ edx-milestones==0.3.0     # via -r requirements/edx/testing.txt
 edx-opaque-keys[django]==2.1.1  # via -r requirements/edx/testing.txt, edx-bulk-grades, edx-ccx-keys, edx-completion, edx-drf-extensions, edx-enterprise, edx-milestones, edx-organizations, edx-proctoring, edx-user-state-client, edx-when, lti-consumer-xblock, xmodule
 edx-organizations==6.7.1  # via -r requirements/edx/testing.txt
 edx-proctoring-proctortrack==1.0.5  # via -r requirements/edx/testing.txt
-edx-proctoring==2.5.10    # via -r requirements/edx/testing.txt, edx-proctoring-proctortrack
+edx-proctoring==2.5.11    # via -r requirements/edx/testing.txt, edx-proctoring-proctortrack
 edx-rbac==1.3.4           # via -r requirements/edx/testing.txt, edx-enterprise
 edx-rest-api-client==5.3.0  # via -r requirements/edx/testing.txt, edx-enterprise, edx-proctoring
 edx-search==2.0.1         # via -r requirements/edx/testing.txt

requirements/edx/testing.txt

@@ -114,7 +114,7 @@ edx-milestones==0.3.0     # via -r requirements/edx/base.txt
 edx-opaque-keys[django]==2.1.1  # via -r requirements/edx/base.txt, edx-bulk-grades, edx-ccx-keys, edx-completion, edx-drf-extensions, edx-enterprise, edx-milestones, edx-organizations, edx-proctoring, edx-user-state-client, edx-when, lti-consumer-xblock, xmodule
 edx-organizations==6.7.1  # via -r requirements/edx/base.txt
 edx-proctoring-proctortrack==1.0.5  # via -r requirements/edx/base.txt
-edx-proctoring==2.5.10    # via -r requirements/edx/base.txt, edx-proctoring-proctortrack
+edx-proctoring==2.5.11    # via -r requirements/edx/base.txt, edx-proctoring-proctortrack
 edx-rbac==1.3.4           # via -r requirements/edx/base.txt, edx-enterprise
 edx-rest-api-client==5.3.0  # via -r requirements/edx/base.txt, edx-enterprise, edx-proctoring
 edx-search==2.0.1         # via -r requirements/edx/base.txt