in net-list and router-list, don't query for each project

This fix is cherry picked from
https://github.com/Juniper/contrail-neutron-plugin/commit/fa7d5df61753bb1ee7a274497089ac06862acee1

Change-Id: I44f10d62906eceea4b03d0e7f821545fe5211305
Merge "in net-list and router-list, don't query for each project" into R1.10