removing nginx role from dependency since it won't run for deploy

playbooks/edx-east/deploy_edxapp.yml

@@ -3,5 +3,4 @@
   sudo: True
   gather_facts: True
   roles:
-    - nginx
     - edxapp

playbooks/edx-east/deploy_ora.yml

@@ -3,5 +3,4 @@
   sudo: True
   gather_facts: True
   roles:
-    - nginx
     - ora

playbooks/edx-east/deploy_xqueue.yml

@@ -3,5 +3,4 @@
   sudo: True
   gather_facts: True
   roles:
-    - nginx
     - xqueue