Bump up rally and rally-openstack

New rally and rally-openstack versions released due to incompatibility
with latest oslo.config.

Change-Id: I7ad2373327be29cd307db5ce4f7db022829e3b35
(cherry picked from commit c0eef76)

Author: mnasiadka

kolla/common/config.py

@@ -711,11 +711,11 @@
     'rally': {
         'type': 'url',
         'location': ('$tarballs_base/openstack/rally/'
-                     'rally-3.1.0.tar.gz')},
+                     'rally-3.2.0.tar.gz')},
     'rally-plugin-openstack': {
         'type': 'url',
         'location': ('$tarballs_base/openstack/rally-openstack/'
-                     'rally-openstack-2.0.0.tar.gz')},
+                     'rally-openstack-2.1.0.tar.gz')},
     'sahara-base': {
         'type': 'url',
         'location': ('$tarballs_base/openstack/sahara/'