packaging: remove '-1' from tarball

Currently, tarballs are built with a '-1' in the filename and their
corresponding initial (containing) directory.  This is both unusual
and disconcerting.  This patch removes the '-1' from both the package
name and the initial directory.

Target: master
Request: 2.8
Request: 2.7
Request: 2.6
Request: 2.2
Patch: http://rb.dcache.org/r/6580/
Acked-by: Tigran Mkrtchyan