MSTP update - 13: hard-linking MSTP config identifier

#Hard-link ed #MSTP #config_identifier through #standard #STP #instance #entries in MSTP module. This will indicate the #MSTP attributes like #config_id_format, #config_name, #config_revision_level, #config_digest,  etc ... This will reduce the memory requirement associated with the config identifier. The hard-linked MSTP config entries enables accessing them directly from the standard STP instance entries.

#802-1S #MSTP update 13 ...
[commit ad1b1f4dcfa5ae59b0255e9f9c2e590b014c96ff]