Add code to parse errors in the 'show route' backend code in the iterative request code.
Add code to parse errors in the 'show route' backend code in the iterative request code.

Restructure the code to return empty tables in case of parse errors. The parse
errors will never happen in today's code since we hand-craft it in the code.

Change-Id: I25468b4c1050925d9e478f125536a107742bf95f
Closes-Bug: 1446009

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