Automate CARP activation and parameter preemption

Summary:
Automate CARP configuration on router nodes. Preemption is also enabled (net.inet.carp.preempt=1) so that the router with the highest priority CARP regains
the MASTER role after recovery or after being start late.

Ref T2205

Test Plan:
1.Apply the state on router nodes.

2.Verify CARP states (MASTER/BACKUP).

3.Simulate failover and recovery.

4.Verify CARP states (MASTER/BACKUP).

Reviewers: dereckson, Duranzed

Reviewed By: dereckson

Subscribers: Duranzed, dereckson

Maniphest Tasks: T2205

Differential Revision: https://devcentral.nasqueron.org/D4006