added cassandra cron flush role

tasks/main.yml

diff --git a/tasks/main.yml b/tasks/main.yml
index 37b3421..ae8d3cc 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,7 +1,7 @@
 ---
 - name: Retrieve ip address of first baas node
   set_fact:
-    baas_mgmt_ip: "{{ hostvars[group['baas'][0] }}"
+    baas_mgmt_ip: "{{ hostvars[group['baas'][0]] }}"
 
 - name: Retrieve access token for superuser - {{ baas_superuser_name }}
   uri: