This adds 2 new config options:
- gitfs_disable_saltenv_mapping - This allows a user to disable the environment mapping logic and rely solely on per-saltenv configuration
- gitfs_ref_types - This allows individual ref types to be ignored
It also includes a performance improvement in retrieving tree objects
matching the desired ref name. Before, we would iterate through the
different refs and check if the name matched the desired ref's name.
Now we just check for a head/tag ref based on the ref path in the
gitdir (e.g. refs/remotes/origin/master or refs/tags/v1.2.3). This
prevents us from needlessly iterating through all refs until a match is
found, which does not scale well when the number of branches and tags is
larger.
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