sysadmin dashboard - Removal of popen, more streamlined git commands, and other optimizations
Merge branch 'feature/cg/sysadmin-dashboard-mongook' of github.com:carsongee/edx-platform into feature/cg/sysadmin-dashboard-mongook

Conflicts:
	lms/djangoapps/dashboard/sysadmin.py
	lms/djangoapps/dashboard/tests/test_sysadmin.py