Support MinIO to be deployed on more than 32 nodes (#8492)

This PR implements locking from a global entity into
a more localized set level entity, allowing for locks
to be held only on the resources which are writing
to a collection of disks rather than a global level.

In this process this PR also removes the top-level
limit of 32 nodes to an unlimited number of nodes. This
is a precursor change before bring in bucket expansion.

cmd/routers.go

@@ -31,7 +31,7 @@ func registerDistXLRouters(router *mux.Router, endpoints EndpointList) {
 	registerPeerRESTHandlers(router)
 
 	// Register distributed namespace lock.
-	registerLockRESTHandlers(router)
+	registerLockRESTHandlers(router, endpoints)
 
 }