added cassandra validation and maintenance playbooks

configuration/update_cache.yml

diff --git a/configuration/update_cache.yml b/configuration/update_cache.yml
index 287a5ca..a6f211c 100644
--- a/configuration/update_cache.yml
+++ b/configuration/update_cache.yml
@@ -1,7 +1,7 @@
 ---
 - hosts: planet
   vars_files:
-  - ~/.apigee/credentials.yml
+  - ~/.apigee-secure/credentials.yml
   tags: ['cache']
   pre_tasks:
   - setup: