* Fix test_vmport_cfg test case failure
* Fix test_vmport_cfg test case failure

Cleanup stale config links and memory leak reported by UT.
Partial-bug:#1470924

Change-Id: I7f51178dc0edec57fefd5b92fa5614de78c05ed2

eonpatapon/contrail-controller,sajuptpm/contrail-controller,reiaaoyama/contrail-controller,sajuptpm/contrail-controller,vmahuli/contrail-controller,reiaaoyama/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,vpramo/contrail-controller,reiaaoyama/contrail-controller,codilime/contrail-controller,hthompson6/contrail-controller,numansiddique/contrail-controller,codilime/contrail-controller,facetothefate/contrail-controller,rombie/contrail-controller,sajuptpm/contrail-controller,nischalsheth/contrail-controller,sajuptpm/contrail-controller,hthompson6/contrail-controller,DreamLab/contrail-controller,nischalsheth/contrail-controller,vpramo/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,facetothefate/contrail-controller,sajuptpm/contrail-controller,vmahuli/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,hthompson6/contrail-controller,DreamLab/contrail-controller,numansiddique/contrail-controller,vpramo/contrail-controller,vpramo/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,numansiddique/contrail-controller,sajuptpm/contrail-controller,eonpatapon/contrail-controller,DreamLab/contrail-controller,eonpatapon/contrail-controller,vmahuli/contrail-controller,vmahuli/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,hthompson6/contrail-controller,facetothefate/contrail-controller,numansiddique/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,reiaaoyama/contrail-controller,eonpatapon/contrail-controller,facetothefate/contrail-controller,hthompson6/contrail-controller,tcpcloud/contrail-controller,reiaaoyama/contrail-controller,vmahuli/contrail-controller,DreamLab/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,codilime/contrail-controller,tcpcloud/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,DreamLab/contrail-controller,vpramo/contrail-controller,tcpcloud/contrail-controller,numansiddique/contrail-controller,facetothefate/contrail-controller,nischalsheth/contrail-controller