Fix Gerrit mimetype setting for direct downloading of files
Fix Gerrit mimetype setting for direct downloading of files

This fix will allow Gerrit users to download yaml and rst files directly
instead of the file wrapped in a zip archive.

Change-Id: Idb3d0e51909ead664751a8a6b5680378348500bf

dhiana/puppet-gerrit,open-switch/infra_puppet-gerrit,open-switch/infra_puppet-gerrit,dhiana/puppet-gerrit,open-switch/infra_puppet-gerrit,dhiana/puppet-gerrit