MSTP update - 14: optimizing CIST port extended parameters

#Hard-link ed #CIST #port #extended configuration entries with #standard #STP #port #entries in MSTP module. These include parameters like #AUTO_EDGE, #AUTO_ISOLATE, etc ... for the CIST port. This will reduce the memory requirement associated with the CIST port extended entries. The hard-linked CIST port extended entries enables accessing them directly from the standard STP port entries.

#802-1S #MSTP update 14 ...
[commit 288c53ea3f726b5246fe6b56c84ca92a1490cc51]