only define no_dd_monitoring where it is needed.

Author: Christopher M. Neill

ansible/gamma-hosts/variables

@@ -74,7 +74,6 @@ registry_host=10.4.4.82
 swarm_token=d363b783f03a845a2c82b081bfe8443e
 user_content_domain=runnable.ninja
 api_hello_runnable_github_token=88ddc423c2312d02a8bbcaad76dd4c374a30e4af
-no_dd_monitoring=false
 
 [ec2:vars]
 env=gamma

ansible/roles/datadog/tasks/main.yml

@@ -27,7 +27,7 @@
 
 - name: add docker to dd-agent group
   sudo: yes
-  when: no_dd_monitoring != true
+  when: no_dd_monitoring is defined
   user:
     name=dd-agent
     groups=docker
@@ -57,7 +57,7 @@
 
 - name: install docker integration
   sudo: yes
-  when: no_dd_monitoring != true
+  when: no_dd_monitoring is defined
   template:
     src=docker_daemon.yaml.j2
     dest=/etc/dd-agent/conf.d/docker_daemon.yaml