Remove mox from tests/unit/network/test_rpcapi.py
Remove mox from tests/unit/network/test_rpcapi.py

This patch replaces mox with mock in tests/unit/network/test_rpcapi.py.

Part of blueprint remove-mox-newton
Change-Id: I7e747e11b68d06b0861e63d5c39dc230c9a8bc49

mahak/nova,hanlind/nova,rahulunair/nova,vmturbo/nova,rahulunair/nova,mahak/nova,alaski/nova,mikalstill/nova,Juniper/nova,mikalstill/nova,cloudbase/nova,jianghuaw/nova,klmitch/nova,vmturbo/nova,gooddata/openstack-nova,mahak/nova,openstack/nova,gooddata/openstack-nova,gooddata/openstack-nova,rajalokan/nova,Juniper/nova,phenoxim/nova,bigswitch/nova,klmitch/nova,openstack/nova,cloudbase/nova,hanlind/nova,Juniper/nova,klmitch/nova,phenoxim/nova,vmturbo/nova,rajalokan/nova,alaski/nova,jianghuaw/nova,Juniper/nova,sebrandon1/nova,klmitch/nova,jianghuaw/nova,sebrandon1/nova,rahulunair/nova,openstack/nova,sebrandon1/nova,hanlind/nova,jianghuaw/nova,rajalokan/nova,vmturbo/nova,rajalokan/nova,gooddata/openstack-nova,cloudbase/nova,mikalstill/nova,bigswitch/nova