tools: fix pim interface config deletion

tools: fix pim interface config deletion

When no ip pim is performed subsequent pim related
configs under the interface also implicitly deleted.

When doing this via frr-reload requires to remove any
explicit no ip pim <blah> lines so delete list.

Testing Done:

running-config:
interface lo
 ip pim
 ip pim use-source 6.0.0.1
exit

frr.conf:
remove two pim config lines.
interface lo
exit

Before fix:
2023-06-29 23:44:26,062  INFO: Failed to execute interface lo  no ip pim use-source 6.0.0.1
2023-06-29 23:44:26,142  INFO: Failed to execute interface lo  no ip pim use-source
2023-06-29 23:44:26,221  INFO: Executed "interface lo  no ip pim"

After fix:
Only no ip pim executed and rest of the other lines removed from delete
list.

2023-06-30 01:07:32,618  INFO: Executed "interface lo  no ip pim"

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