support installing clients at released versions

expand the devstack support for libraries from released versions to
support python-* clients and tempest_lib.

Depends-On: I81b0d228e7769758c61e5b0323ecfce8c8886d39

Change-Id: I26fac0ccf8fd4818e24618d56bf04b32306f88f6
diff --git a/functions-common b/functions-common
index 48edba8..4e6ad14 100644
--- a/functions-common
+++ b/functions-common
@@ -1621,6 +1621,7 @@
     return $enabled
 }
 
+
 # setup a library by name. If we are trying to use the library from
 # git, we'll do a git based install, otherwise we'll punt and the
 # library should be installed by a requirements pull from another