chore: mark private variables as such and remove obsolete ones

lib/replyHandler.js

@@ -15,8 +15,8 @@ function onError (client, err) {
   }
 
   // Count down pub sub mode if in entering modus
-  if (client.pubSubMode > 1) {
-    client.pubSubMode--
+  if (client._pubSubMode > 1) {
+    client._pubSubMode--
   }
 
   const match = err.message.match(utils.errCode)
@@ -40,7 +40,7 @@ function onResult (client, reply) {
   // If in monitor mode, all normal commands are still working and we only want to emit the streamlined commands
   // As this is not the average use case and monitor is expensive anyway, let's change the code here, to improve
   // the average performance of all other commands in case of no monitor mode
-  if (client.monitoring) {
+  if (client._monitoring) {
     var replyStr
     if (client.buffers && Buffer.isBuffer(reply)) {
       replyStr = reply.toString()
@@ -58,10 +58,10 @@ function onResult (client, reply) {
       return
     }
   }
-  if (client.pubSubMode === 0) {
+  if (client._pubSubMode === 0) {
     normalReply(client, reply)
-  } else if (client.pubSubMode !== 1) {
-    client.pubSubMode--
+  } else if (client._pubSubMode !== 1) {
+    client._pubSubMode--
     normalReply(client, reply)
   } else if (!(reply instanceof Array) || reply.length <= 2) {
     // Only PING and QUIT are allowed in this context besides the pub sub commands