Remove Puppet templates endings when calling getManifestTemplate

getManifestTemplate sets the default template ending 'pp' when not set
in the filename. It is not longer necessary to use the default template
ending when calling getManifestTemplate.

Change-Id: Ie0c487eef6196fe6276694d7973e943d42a59ae9
Merge "Remove Puppet templates endings when calling getManifestTemplate"