if there is a variant use it in the volume id and shorten it. this

will make each producst install tree have different volume ids for
their isos

Signed-off-by: Dennis Gilmore <dennis@ausil.us>

pungi/gather.py

@@ -1352,6 +1352,9 @@ class Pungi(PungiBase):
                         'Alpha': 'A',
                         'Beta': 'B',
                         'TC': 'T'}
+        if self.config.get('pungi', 'variant'):
+            name += '%s-%s' % (self.config.get('pungi', 'family'), self.config.get('pungi', 'variant'))
+        else:
             name = self.config.get('pungi', 'family')
         version = self.config.get('pungi', 'version')
         arch = self.tree_arch