Fix command line arguments has lower priority than config file
Fix command line arguments has lower priority than config file

  *This bug happened because of how oslo is handling the order of command line

  *Make sure the command line parameter will always send last

Change-Id: Ia106ce2bd2994c494a6c25039d92358eeb0abdb9
Closes-Bug: #1454111

dennybaa/mistral,openstack/mistral,StackStorm/mistral,dennybaa/mistral,openstack/mistral,StackStorm/mistral