bgpd: clear ip bgp dampening was not triggering the route calculation for the prefix

bgpd: clear ip bgp dampening was not triggering the route calculation for the prefix

Description:
    clear ip bgp dampening was not triggering the route
    calculation for the prefix, Due to this prefix are not install in
    RIB(Zebra) and not adv to neighbor

Problem Description/Summary :
    clear ip bgp dampening was not triggering the route
    calculation for the prefix, Due to this prefix are not install in
    RIB(Zebra) and not adv to neighbor

    Fix: When clear ip bgp dampening, route are put for route-calculation as
    that it is install in the Zebra and adv to neighbor.

Signed-off-by: sudhanshukumar22 <sudhanshu.kumar@broadcom.com>