ofa_neutron_agent: Fix _phys_br_block_untranslated_traffic
ofa_neutron_agent: Fix _phys_br_block_untranslated_traffic

Install the flow to the correct bridge.

Closes-Bug: 1301142
Change-Id: I2aa7ffd6bb297837a39cdd00794af100bf9ab407

gkotton/vmware-nsx,gkotton/vmware-nsx