Merge pull request #4100 from edx/youngstrom/fix_ec2_var

Fix ec2 template variable for jenkins_common

playbooks/roles/jenkins_common/templates/config/ec2_config.yml.j2

@@ -3,7 +3,7 @@ CLOUDS:
     - NAME: '{{ JENKINS_EC2_REGION }}'
       ACCESS_KEY_ID: '{{ JENKINS_EC2_ACCESS_KEY_ID }}'
       SECRET_ACCESS_KEY: '{{ JENKINS_EC2_SECRET_ACCESS_KEY }}'
-      USE_INSTANCE_PROFILE_FOR_CREDS: '{{ jenkins_common_use_instance_profile_for_creds }}'
+      USE_INSTANCE_PROFILE_FOR_CREDS: {{ jenkins_common_use_instance_profile_for_creds }}
       REGION: '{{ JENKINS_EC2_REGION }}'
       EC2_PRIVATE_KEY_PATH: '{{ jenkins_common_config_path }}/ec2/id_rsa'
       INSTANCE_CAP: '{{ jenkins_common_instance_cap }}'