Unify version strings across the infrastructure

Currently, we use different forms of version string:

6.0.1-ER1 e.g. distribution zips URLs, http://download.devel.redhat.com/devel/candidates/JBEAP/JBEAP-6.0.1-ER1/
6.0.1.ER1 e.g. distribution zip names, http://download.devel.redhat.com/devel/candidates/JBEAP/JBEAP-6.0.1-ER1/jboss-eap-6.0.1.ER1-src.zip
and git tags http://download.lab.bos.redhat.com/brewroot/repos/jb-eap-6.0.0-ga-rhel-6-updates-build/latest/maven/
6.0.1-er1 e.g. http://download.lab.bos.redhat.com/brewroot/repos/jb-eap-6.0.0-ga-rhel-6-updates-build/latest/maven/

We should choose one and use that to limit chances for typos.
I vote for first form, following www.semver.org as well as our norms.