Workaround for connectivity issue from tenant VM to external provider VM
when both are on the same compute with DVR + VLAN tenant network.
Related-Bug: OSPRH-17095
Related-Bug: OSPRH-9095
Change-Id: Ica1489cbdff6be4c68bb049d4b8c39b0b8b8af67
Signed-off-by: Renjing Xiao <rxiao@redhat.com>