do not reset pingTimer

don't bother with this "only ping when we havent heard from them". lets
just always ping every peer from the sendRoutine every 10s no matter
what. if they dont pong within pongTimeout, disconnect :)

p2p/conn/connection.go

@@ -494,11 +494,6 @@ FOR_LOOP:
 			c.stopForError(err)
 			break FOR_LOOP
 		}
-
-		// TODO: don't bother with this "only ping when we havent heard from them".
-		// lets just always ping every peer from the sendRoutine every 10s no matter what.
-		// if they dont pong within pongTimeout, disconnect :)
-		c.pingTimer.Reset()
 	}
 
 	// Cleanup