Scheduling of quiet vs. verbose config saving

Rename the current ECONFIG_NEED_WRITE to ECONFIG_NEED_VERBOSE_WRITE
as it always broadcasts the result for SIGUSR1, even on success.
Keep ECONFIG_NEED_WRITE for cases where the config should be written
without a notification of success.

include/znc/znc.h

@@ -40,7 +40,8 @@ public:
 	enum ConfigState {
 		ECONFIG_NOTHING,
 		ECONFIG_NEED_REHASH,
-		ECONFIG_NEED_WRITE
+		ECONFIG_NEED_WRITE,
+		ECONFIG_NEED_VERBOSE_WRITE
 	};
 
 	void DeleteUsers();