Do not generate default objects for all resources by default
Do not generate default objects for all resources by default

Instead, we will now generate default instances only when
specifically requested. This way, we will not create unused objects
whenever new classes are added in schema.

Change-Id: I7cb3fcd120ae6647bf09920983a51bb307b039c8
Closes-Bug: 1440269

nischalsheth/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller