Add Salt configuration for FRRouting OSPF on routers.

The IntraNought network will be shared to Windriver.

A GRE tunnel (gre1) is used on top of this network to establish a direct point-to-point link between
each router and Windriver.

OSPF is enabled on both gre1 and vmx0, but route exchange occurs only on gre1 because it is configured as non-passive ("no ip ospf passive").

Each router has a unique OSPF router-id to ensure correct neighbor relationships.

The OSPF cost is left to its default (10) value for now and will be adjusted later depending on which router
is active.

-salt 'router-002' state.apply roles/router
-salt 'router-003' state.apply roles/router