QmlProfiler: Unify local and tcp connection mechanism

Use the URL scheme to distinguish between them, check that in
QmlProfilerClientManager and test all possible combinations of URL
parts.

Change-Id: I6583e5bf18eda0344a299a279c12578c4ebc7ffe
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmlprofiler/tests/localqmlprofilerrunner_test.cpp

@@ -56,6 +56,7 @@ void LocalQmlProfilerRunnerTest::testRunner()
     debuggee.environment = Utils::Environment::systemEnvironment();
 
     // should not be used anywhere but cannot be empty
+    serverUrl.setScheme(ProjectExplorer::urlSocketScheme());
     serverUrl.setPath("invalid");
 
     runControl = new ProjectExplorer::RunControl(nullptr,