apply all dict extensions for a network during create.
apply all dict extensions for a network during create.

Change-Id: I26f3dc059bbf14f11b9fdd395b1df196372bc9fd
Closes-Bug: OPENSTACK-1565, OPENSTACK-1569

naveensan1/nuage-openstack-neutron,nuagenetworks/nuage-openstack-neutron,naveensan1/nuage-openstack-neutron,nuagenetworks/nuage-openstack-neutron