Properly name ADB hashmap and named log memory contexts

The ADB hashmaps are stored in extra memory contexts, so the hash
tables are excluded from the overmem accounting.  The new memory
context was unnamed, give it a proper name.

Same thing has happened with extra memory context used for named
global log context - give the extra memory context a proper name.

bin/named/log.c

@@ -60,6 +60,7 @@ named_log_init(bool safe) {
 	 * Setup a logging context.
 	 */
 	isc_mem_create(&log_mctx);
+	isc_mem_setname(log_mctx, "named_log");
 	isc_log_create(log_mctx, &named_g_lctx, &lcfg);
 	isc_mem_detach(&log_mctx);