Merge pull request #1547 from edx/jarv/turn-off-analytics-by-default

this needs to default to false because it currently depends on

playbooks/roles/edxapp/defaults/main.yml

@@ -115,7 +115,7 @@ EDXAPP_FEATURES:
   AUTH_USE_OPENID_PROVIDER: true
   CERTIFICATES_ENABLED: true
   ENABLE_DISCUSSION_SERVICE: true
-  ENABLE_INSTRUCTOR_ANALYTICS: true
+  ENABLE_INSTRUCTOR_ANALYTICS: false
   SUBDOMAIN_BRANDING: false
   SUBDOMAIN_COURSE_LISTINGS: false
   PREVIEW_LMS_BASE: "{{ EDXAPP_PREVIEW_LMS_BASE }}"