Add update_project_user_role_task.py

The file is used to bind the project altogether with its users and roles at the end of migration.

fix small bug in test_usertask.py
Fix small bug in roletask.py

which will lead execution
RoleMigrationTask('task_name')
fail
Merge branch 'master' of https://github.com/Phoenix1708/OpenAcademy_OpenStack_Flyway
Add update_project_user_role_task.py

The file is used to bind the project altogether with its users and roles at the end of migration.

fix a small bug in test_usertask.py