The value of vRtrMplsGenP2mpS2lFastRetry specifies the time, in
seconds, active path point to multipoint (P2MP) source to leaf (S2L)
LSP waits before it attempts to re-establish itself. This timer is
started after first attempt to setup active path P2MP S2L LSP fails.
When vRtrMplsGenP2mpS2lFastRetry is set to 0, fast retry timer
for active path P2MP S2L LSP is disabled.