Use master of the edx-platform.

playbooks/edx-east/edx_vpc.yml

@@ -36,6 +36,7 @@
       edxapp_lms_env: 'lms.envs.load_test'
       migrate_db: 'yes'
       openid_workaround: 'yes'
+      edx_platform_commit: 'HEAD'
     - splunkforwarder
 - hosts: tag_role_edxapp:!first_in_tag_role_edxapp
   sudo: True
@@ -55,6 +56,7 @@
       - lms-preview
     - role: 'edxapp'
       edxapp_lms_env: 'lms.envs.load_test'
+      edx_platform_commit: 'HEAD'
     - splunkforwarder
 - hosts: tag_role_worker
   sudo: True
@@ -74,6 +76,7 @@
     - role: 'edxapp'
       edxapp_lms_env: 'lms.envs.load_test'
       celery_worker: True
+      edx_platform_commit: 'HEAD'
     - splunkforwarder
 - hosts: tag_role_xserver
   sudo: True