Make ci-launch directory readable by admin users

Commit 5ae5e6cc added puppetry for /root/ci-launch on the Puppet
master server, but set permissions on it too restrictive for users
launching new servers to be able to read the files within it.

* launch/README: Note that the user following these directions
should also be in the admin group.

* modules/openstack_project/manifests/puppetmaster.pp: Set group
ownership of /root/ci-launch to admin so members of that group will
be able to read the files within it.

Change-Id: I6c657eb4311b27ce329f249df3e60c2b902677ae
Merge "Make ci-launch directory readable by admin users"