Correct name of source archive if reference contains '/'

If we have reference like stable/kilo name of source archive
will contain only last part of reference. We should replace '/'
with '-' to have full name. This is useful for correct
identification of source code afterwards.

Change-Id: I1ff1015e3f7926110d0fcb59504e58a5e80a75f9
Closes-Bug: #1492279

kolla/cmd/build.py

@@ -106,7 +106,8 @@ class WorkerThread(Thread):
                 return
 
         elif source.get('type') == 'git':
-            clone_dir = dest_archive + '-' + source['reference']
+            clone_dir = '{}-{}'.format(dest_archive,
+                                       source['reference'].replace('/', '-'))
             try:
                 LOG.debug("{}:Cloning from {}".format(image['name'],
                                                       source['source']))