Fixed QtNetwork test to use '127.0.0.1' instead of 'localhost'

This is necessary to make all test to be able run on any buildbot machine.
Fix Http server shutdown sequence to avoid deadlocks.

Fixes bug #587

Reviewer: Hugo Parente Lima <hugo.lima@openbossa.org>
          Marcelo Lira <marcelo.lira@openbossa.org>

tests/QtNetwork/http_test.py

@@ -16,18 +16,24 @@ class HttpSignalsCase(UsesQCoreApplication):
         super(HttpSignalsCase, self).setUp()
         self.httpd = TestServer()
         self.httpd.start()
-        self.http = QHttp('localhost' , self.httpd.port())
+        self.http = QHttp("127.0.0.1" , self.httpd.port())
         self.called = False
 
     def tearDown(self):
-        self.httpd.shutdown()
+        if self.httpd:
+            self.httpd.shutdown()
+            del self.httpd
         self.http = None
         self.httpd = None
         super(HttpSignalsCase, self).tearDown()
 
+    def goAway(self):
+        self.httpd.shutdown()
+        self.app.quit()
+
     def callback(self, ident):
         self.called = True
-        self.app.quit()
+        self.goAway()
 
     def testDefaultArgs(self):
         #QHttp signal requestStarted signal