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
(cherry picked from commit ebed2e6b92b38d4ddbd7035af6dd45166face7cc)
Merge "Remove Puppet templates endings when calling getManifestTemplate" into juno