zypper_repository: Remove trailing "/". Identifies "logically" identical repos.

Example: ftp://download.nvidia.com/opensuse/12.2 == ftp://download.nvidia.com/opensuse/12.2/

library/packaging/zypper_repository

@@ -105,7 +105,7 @@ def repo_exists(module, **kwargs):
 
         for k, v in realrepo.items():
             if k in repocmp:
-                if v != repocmp[k]:
+                if v.rstrip("/") != repocmp[k].rstrip("/"):
                     return False
         return True