Refactor debrelease and rpmrelease to abstract release

This commit updates the packaging tasks. It takes an environment variable
RELEASE and uses it to populate @release, which is then used to populate
@debrelease and @rpmrelease in the packaging tasks. This will allow it to be
more easily overridable. It also updates the test to set @release.
Add RELEASE to all remote calls. Abstract the environment for remote calls into instance variables @deb_env, @mockf_env, @mockrc_env
Move to puppetlabs1 instead of 1puppetlabs. This allows the rpm and debian versions strings to maintain similarity while allowing release overrides.
Merge pull request #99 from haus/add_release_overrides

Add release overrides