packaging.GitbuilderProject: add a test to ensure base_url is correct for wheezy
packaging.GitbuilderProject: add a test to ensure base_url is correct for wheezy

remote.os.codename returns an empty string for debian which resulted in
the base_url missing the 'wheezy' part of it, this fixes that.

Signed-off-by: Andrew Schoen <1bb641dc23c3a93cce4eee683bcf4b2bea7903a3@redhat.com>

SUSE/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,dmick/teuthology,michaelsevilla/teuthology,ceph/teuthology,dreamhost/teuthology,robbat2/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,dreamhost/teuthology,robbat2/teuthology,caibo2014/teuthology,SUSE/teuthology,ktdreyer/teuthology,caibo2014/teuthology,dmick/teuthology