Correct tag name for core components

We changed the artifactId in quattor/configuration-modules-core@460640e
but the publishing code was still attempting to use the previous artifactId
this left the repository at the HEAD of master which led to SNAPSHOT versions
being pushed into quattor/template-library-core.
Merge pull request #52 from jrha/fix-core-template-publishing

Correct tag name for core components