Add salt.utils.strip_proto()
gitfs: replace refs to _strip_proto()

Also a bit of variable name cleanup
gitfs: remove emptydirs collection logic

Git cannot have empty dirs. This logic is unnecessary.
Add hgfs mountpoints and per-remote params
Add new hgfs features to docs
Add environment to file state error

Just a little enhancement to error reporting.
Lint fix

Remove extra line (See below link for more info)

http://jenkins.saltstack.com/job/salt-pr-lint/1333/violations/file/salt/utils/__init__.py/
Merge pull request #10572 from terminalmage/hgfs-mountpoints

Add hgfs mountpoints and per-repo configuration params