Don't run migrations by default.

util/jenkins/ansible-provision.sh

@@ -260,8 +260,7 @@ fi
 
 # deploy the edx_ansible role
 run_ansible edx_ansible.yml -i "${deploy_host}," $extra_var_arg --user ubuntu
-cat $extra_vars_file | grep -v "_version" > ${extra_vars_file}_clean
-cat ${extra_vars_file}_clean
+cat $extra_vars_file | grep -v -E "_version|migrate_db" | tee ${extra_vars_file}_clean
 ansible -c ssh -i "${deploy_host}," $deploy_host -m copy -a "src=${extra_vars_file}_clean dest=/edx/app/edx_ansible/server-vars.yml" -u ubuntu -b
 ret=$?
 if [[ $ret -ne 0 ]]; then