pimd: Added new option "detail" in the "debug pim nht" CLI

pimd: Added new option "detail" in the "debug pim nht" CLI

Problem Statement:
=================
PIM Logs are coming at interval of 1 minute although pim
is not enabled.

Root Cause Analysis:
====================
By default, RCPM configures the PIM debugs when router comes up
via script. The product cannot disable PIM even though it is not required.
Hence moving these logs under a new debug option which will not be
enabled by default.

Fix:
====
Added a new option "detail" in the cli:
debug pim nht detail

Co-author: Mobashshera Rasool <mrasool@vmware.com>
Signed-off-by: Sai Gomathi <nsaigomathi@vmware.com>