Merge pull request #2781 from edx/cdodge/password-history-enforcements

cms/envs/aws.py

cms/envs/common.py

...goapps/student/migrations/0032_auto__add_loginfailures.py

...apps/student/migrations/0033_auto__add_passwordhistory.py

common/djangoapps/student/models.py

common/djangoapps/student/tests/test_password_history.py

common/djangoapps/student/tests/test_password_policy.py

common/djangoapps/student/tests/test_reset_password.py

common/djangoapps/student/tests/tests.py

common/djangoapps/student/views.py

lms/djangoapps/courseware/tests/test_password_history.py

lms/envs/aws.py

lms/envs/common.py

lms/templates/registration/password_reset_confirm.html