Move read/write destroyAllNow to pool.

lib/dialects/abstract/connection-manager.js

@@ -48,9 +48,7 @@ ConnectionManager.prototype.onProcessExit = function() {
 
   if (this.pool) {
     this.pool.drain(function() {
-      if (self.pool.destroyAllNow) self.pool.destroyAllNow();
-      if (self.pool.read && self.pool.read.destroyAllNow) self.pool.read.destroyAllNow();
-      if (self.pool.write && self.pool.write.destroyAllNow) self.pool.write.destroyAllNow();
+      self.pool.destroyAllNow();
     });
   }
 };
@@ -122,6 +120,10 @@ ConnectionManager.prototype.initPools = function () {
       destroy: function(connection) {
         return self.pool[connection.queryType].destroy(connection);
       },
+      destroyAllNow: function() {
+        self.pool.read.destroyAllNow();
+        self.pool.write.destroyAllNow();
+      },
       drain: function(cb) {
         self.pool.write.drain(function() {
           self.pool.read.drain(cb);