tools: fix frr-reload for no ip msdp peer cmd

tools: fix frr-reload for no ip msdp peer cmd

no form of 'ip pm msdp peer <> source <>' does not
accept source argument. Stip the 'source <>' part from
config line being deleted via frr-reload.

Ticket: #3874971
Testing:

Config:
vrf blue
 ip msdp peer 1.1.1.1 source 1.1.1.1

frr-reload failure log:
2024-04-23 02:08:32,501  INFO: Failed to execute vrf blue  no ip
msdp peer 1.1.1.1 source 1.1.1.1 exit
2024-04-23 02:08:32,501 ERROR: "vrf blue --  no ip msdp peer 1.1.1.1
source 1.1.1.1 -- exit" we failed to remove this command
2024-04-23 02:08:32,501 ERROR: % Unknown command:  no ip msdp peer
1.1.1.1 source 1.1.1.1

Signed-off-by: Chirag Shah <chirag@nvidia.com>