Create dedicated puppet volume for rsync container

New host volume /etc/puppet maps to rsync container /puppet,
freeing up /etc/puppet:/etc/puppet mapping, which may be enabled
for some desired testing function.
This also has a desired benefit to use bundled manifests when
deploying rsync container, but still serve arbitrary host puppet
contents via rsync.

Change-Id: I6e7f29679a7d475a6c49dd6e3d498c14c943408f
Closes-Bug: #1382531
Merge "Create dedicated puppet volume for rsync container" into stable/5.1