Close emitter connections in ObjC 4 & 5

[#120637007]

Author: camelpunch

objective-c/tutorial4/tutorial4/ViewController.m

@@ -46,6 +46,8 @@ - (void)emitLogDirect:(NSString *)msg severity:(NSString *)severity {
 
     [x publish:msg routingKey:severity];
     NSLog(@"Sent '%@'", msg);
+
+    [conn close];
 }
 
 @end

objective-c/tutorial5/tutorial5/ViewController.m

@@ -46,6 +46,8 @@ - (void)emitLogTopic:(NSString *)msg routingKey:(NSString *)routingKey {
 
     [x publish:msg routingKey:routingKey];
     NSLog(@"Sent '%@'", msg);
+
+    [conn close];
 }
 
 @end