Adding additonal path to search for git information on sysadmin dashboard
When viewing the sysadmin dashboard courses tag, we also search the git
repository directory in addition to the DATA_DIR to try and find
the course git repo to get hash, last commit, and last editor information
for each loaded course if available.
Merge pull request #3493 from carsongee/cg/sysdash_git_info

Adding additonal path to search for git information on sysadmin dashboard