Update the create_user play to allow creating users without sudo access.
Merge pull request #789 from edx/feanil/update_create_user

Update the create_user play to allow creating users without sudo access.
Add a role to install aws specific tools.
Merge remote-tracking branch 'origin/master' into jarv/s3-logrotate
Merge remote-tracking branch 'origin/feanil/aws_role' into jarv/s3-logrotate