Adding FW rules to protect the traffic north-south behind a T1 router.
This will be done only if a firewall was attached to the router.
This includes:
- FWaaS rules
- Drop all default rule
When the firewall is deleted or the router removed from it,
a default allow all rule will be set.
For the rotuer firewall to work, the rotuer NAT rules should set
nat-bypass=False.
Change-Id: Iba03db8ca67ee10d1c54b96fb41a888cb549684d
754e0e7561