Change file resource definition to only a variable

The $gitpath (aka gerrit.basePath) is the only portion of the resource
name. Syntastic complained about a string with only a variable in it so
switch it to an unquoted string.

Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>
Finish off gerrit::config

Finish off prototyping gerrit::config and the rspec tests

Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>
Add gerrit::config::git_config

Define for building out gerrit config file changes. Currently trying to
figure out how to take our options hash and pass that from
gerrit::config into gerrit::config::git_config via a create_resources or
something sanely.

Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>