[Bearer] Try a bit harder to open a network session

The symptoms were made apparent in the xmlpatterns command line
utility when trying to use the synchronous HTTP code path in
QXmlQuery for fetching schemas.

Change-Id: I93b283fdec4b501a5c1fc646f7ddc30d8407f5ae
Reviewed-by: Markus Goetz <markus@woboq.com>
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

src/network/access/qnetworkreplyhttpimpl.cpp

@@ -1585,8 +1585,14 @@ bool QNetworkReplyHttpImplPrivate::start()
                             q, SLOT(_q_networkSessionUsagePoliciesChanged(QNetworkSession::UsagePolicies)));
         postRequest();
         return true;
+    } else if (synchronous) {
+        // Command line applications using the synchronous path such as xmlpatterns may need an extra push.
+        networkSession->open();
+        if (networkSession->waitForOpened()) {
+            postRequest();
+            return true;
+        }
     }
-
     return false;
 #endif
 }