Added a virtual package for repo only slaves

jenkins-debian-glue is the base package containing all required scripts
 - jenkins-debian-glue-repoenv  - virtual package for repo only slaves
 - jenkins-debian-glue-buildenv - virtual package for build only slaves
Merge branch 'master' of https://github.com/bmiklautz/jenkins-debian-glue

https://github.com/mika/jenkins-debian-glue/pull/75
puppet: install scm-api plugin, required for git plugin

| SEVERE: Failed Loading plugin git
| java.io.IOException: Dependency scm-api (0.1) doesn't exist
wrap-and-sort debian/control file

Git-Dch: ignore
Add jenkins-debian-glue-repoenv to Recommends and default installation list

We want to have jenkins-debian-glue-repoenv by default on
automatically installed machines and users typically want it,
though they don't strictly need it, so add it to Recommends.
Drop trailing dot in package descriptions of jenkins-debian-glue-{repoenv,buildenv}

Make lintian happy
Release new version 0.7.0
Drop jenkins-debian-glue-repoenv package + add dependency on "reprepro | freight" to jenkins-debian-glue

reprepro should be present on every system to avoid failures with
package inclusion in repository. Depending on reprepro in the
main jenkins-debian-glue package avoids that problem while still
supporting setups where cowbuilder etc aren't necessary on
repository-only systems.

Closes: #76
Add jenkins-debian-glue-buildenv-git to Recommends
Release new version 0.7.1
generate-reprepro-codename: refer to /etc/jenkins/debian_glue

We don't use/ship /usr/share/jenkins-debian-glue/examples/debian_glue
any longer, it's provided as /etc/jenkins/debian_glue instead.