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/basic_auth_test.py

@@ -15,19 +15,23 @@ class testAuthenticationSignal(UsesQCoreApplication):
         self._resultOk = False
 
     def tearDown(self):
-        self.httpd.shutdown()
-        del self.httpd
+        if self.httpd:
+            self.httpd.shutdown()
+            del self.httpd
         super(testAuthenticationSignal, self).tearDown()
 
+    def goAway(self):
+        self.httpd.shutdown()
+        self.app.quit()
+        self.httpd = None
+
     def onAuthRequest(self, hostname, port, auth):
         self.assert_(isinstance(auth, QAuthenticator))
         self._resultOk = True
-        self.app.quit()
-
+        self.goAway()
 
     def testwaitSignal(self):
-        http = QHttp()
-        http.setHost("localhost", self.httpd.port())
+        http = QHttp('127.0.0.1', self.httpd.port())
         http.connect(SIGNAL("authenticationRequired(const QString&, quint16, QAuthenticator*)"), self.onAuthRequest)
         path = QUrl.toPercentEncoding("/index.html", "!$&'()*+,;=:@/")
         data = http.get(str(path))
@@ -35,8 +39,7 @@ class testAuthenticationSignal(UsesQCoreApplication):
         self.assert_(self._resultOk)
 
     def testwaitSignal2(self):
-        http = QHttp()
-        http.setHost("localhost", self.httpd.port())
+        http = QHttp('127.0.0.1', self.httpd.port())
         # Using new signal slot syntax causes a segfault
         http.authenticationRequired.connect(self.onAuthRequest)
         path = QUrl.toPercentEncoding("/index.html", "!$&'()*+,;=:@/")