Add gitfs configuration parameters to master config docs

This commit adds the new gitfs_provider parameter, as well as several
other params for gitfs that were not documented.

doc/ref/configuration/master.rst

@@ -201,7 +201,7 @@ jobs dir
 ``ext_job_cache``
 -----------------
 
-Default: ''
+Default: ``''``
 
 Used to specify a default returner for all minions, when this option is set
 the specified returner needs to be properly configured and the minions will
@@ -576,7 +576,7 @@ Example:
 
     fileserver_backend:
       - roots
-      - gitfs
+      - git
 
 .. conf_master:: file_roots
 
@@ -640,6 +640,83 @@ The buffer size in the file server in bytes
 
     file_buffer_size: 1048576
 
+.. conf_master:: gitfs_provider
+
+``gitfs_provider``
+------------------
+
+.. versionadded:: Helium
+
+Gitfs can be provided by one of two python modules: `GitPython`_ or `pygit2`_.
+If using pygit2, both libgit2 and git itself must also be installed. More
+information can be found in the :mod:`gitfs backend documentation
+<salt.fileserver.gitfs>`.
+
+.. _GitPython: https://github.com/gitpython-developers/GitPython
+.. _pygit2: https://github.com/libgit2/pygit2
+
+.. code-block:: yaml
+
+    gitfs_provider: pygit2
+
+.. conf_master:: gitfs_remotes
+
+``gitfs_remotes``
+-----------------
+
+Default: ``[]``
+
+When using the git fileserver backend at least one git remote needs to be
+defined. The user running the salt master will need read access to the repo.
+
+The repos will be searched in order to find the file requested by a client
+and the first repo to have the file will return it.
+When using the git backend branches and tags are translated into salt
+environments.
+
+.. code-block:: yaml
+
+    gitfs_remotes:
+      - git://github.com/saltstack/salt-states.git
+      - file:///var/git/saltmaster
+
+.. note::
+    ``file://`` repos will be treated as a remote, so refs you want used must
+    exist in that repo as *local* refs.
+
+.. conf_master:: gitfs_ssl_verify
+
+``gitfs_ssl_verify``
+--------------------
+
+Default: ``[]``
+
+The ``gitfs_ssl_verify`` option specifies whether to ignore ssl certificate
+errors when contacting the gitfs backend. You might want to set this to
+false if you're using a git backend that uses a self-signed certificate but
+keep in mind that setting this flag to anything other than the default of True
+is a security concern, you may want to try using the ssh transport.
+
+.. code-block:: yaml
+
+    gitfs_ssl_verify: True
+
+.. conf_master:: gitfs_root
+
+``gitfs_root``
+--------------
+
+Default: ``''``
+
+The ``gitfs_root`` option gives the ability to serve files from a subdirectory
+within the repository. The path is defined relative to the root of the
+repository and defaults to the repository root.
+
+.. code-block:: yaml
+
+    gitfs_root: somefolder/otherfolder
+
+
 .. _pillar-configuration:
 
 Pillar Configuration