Fix run_vm_job example

 * Fixed run_vm_example according to https://review.openstack.org/#/c/100904/,
   and it is also optimized by defining base-parameters in Nova namespace
 * Fixed task.publish property: we use YAQL in values of dictionaries
   instead of string key

Change-Id: If90698e1235984ba92ff605586ea58b94b96ae1f