Change FileDescriptorSet to be an optional field in self describing message proto file to accomodate any future plans to send schemas separately from the protobuf messages.
Change FileDescriptorSet to be an optional field in self describing
message proto file to accomodate any future plans to send schemas
separately from the protobuf messages.

Change-Id: I4a2b96585b20102a850503cc23ed0a354bbb2771

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