Bump cirros image versions to 5.1 and 5.2

Updated/Added:
  - image sigining routine commands
  - prepare.sh
  - cmp-check.sh
  - configure.sh updated with image versions 5.1 and 5.2
  - rally scenarios updates

  Related PROD: PROD-36794

Change-Id: I8e3ef81c3ecb51af97cb08c676dbfd9804e0d803
diff --git a/tempest/tempest_ext.conf b/tempest/tempest_ext.conf
index 6d55002..6a18040 100644
--- a/tempest/tempest_ext.conf
+++ b/tempest/tempest_ext.conf
@@ -68,7 +68,7 @@
 
 [validation]
 run_validation = true
-image_ssh_password = cubswin:)
+image_ssh_password = gocubsgo
 ssh_timeout = 130
 ping_timeout = 20