bgpd: Optimizing route-map's processing of dependencies.

bgpd: Optimizing route-map's processing of dependencies.

Say for eg., 256 prefix-list entries are pasted to VTYSH.
This results in BGP processing the events for several minutes.

BGPD starts a timer for 5 seconds when the first dependency configuraion
is received. On timer expiry, BGP process dependent route-maps.
After this processing, BGPD reads the configurations received in the
next 5 seconds and then re-processes the route-maps from the beginning.
This cyclic re-processing consumes time and CPU cycles.

Instead of starting a timer when the first configuration is received,
everytime a configuration is received, the existing timer is reset.
This would mean that all the configurations are read first before the timer
expires. This eliminates the cyclic re-processing.

Signed-off-by: NaveenThanikachalam nthanikachal@vmware.com