removing unecessary tasks

docker/plays/edxapp.yml

@@ -8,15 +8,3 @@
   roles:
     - docker
     - edxapp
-    - role: datadog
-      when: COMMON_ENABLE_DATADOG
-    - role: splunkforwarder
-      when: COMMON_ENABLE_SPLUNKFORWARDER
-    - role: newrelic
-      NEWRELIC_LOGWATCH:
-        - logwatch-503.j2
-        - logwatch-cms-errors.j2
-        - logwatch-lms-errors.j2
-      when: COMMON_ENABLE_NEWRELIC
-    - role: minos
-      when: COMMON_ENABLE_MINOS