Several fixes to xqwatcher role
- Missing dictionary value of PYTHON_REQUIREMENTS
- Mispelling and boolification of aa-enforce/aa-complain mode
- Changed supervisord port to 9003 tro avoid conflict with devpi role
- Added course list to with_items of aa-enforce task
- Corrected data directory
- Corrected supervisord service name
Remove redundant app_dir and replace data_dir with app_data
Merge pull request #1349 from edx/cg/xqwatcher_fixes

Several fixes to xqwatcher role