Utils: Join SynchronousProcess::run and runBlocking implementations

Make functionality dependent on an (intentionally ugly)
setProcessUserEventWhileRunning call.

Also, back-paddle a bit on API combination of QtcProcess and
SynchronousPrceoss for now and prevent the QtcProcess-and-
runBlocking and SynchronousProcess-and-start combinations.

Goal is still to have all in QtcProcess in the end, but this
may take a while.

Change-Id: Ic146ec5db0ab8dc9613e5b2af5f4dc90bc7465ca
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/android/androidsdkmanager.cpp

@@ -155,7 +155,8 @@ static bool sdkManagerCommand(const AndroidConfig &config, const QStringList &ar
     proc.setTimeoutS(timeout);
     proc.setTimeOutMessageBoxEnabled(true);
     proc.setCommand({config.sdkManagerToolPath(), newArgs});
-    proc.run();
+    proc.setProcessUserEventWhileRunning();
+    proc.runBlocking();
     if (output)
         *output = proc.allOutput();
     return proc.result() == QtcProcess::Finished;
@@ -196,7 +197,8 @@ static void sdkManagerCommand(const AndroidConfig &config, const QStringList &ar
                          &proc, &SynchronousProcess::stopProcess);
     }
     proc.setCommand({config.sdkManagerToolPath(), newArgs});
-    proc.run();
+    proc.setProcessUserEventWhileRunning();
+    proc.runBlocking();
     if (assertionFound) {
         output.success = false;
         output.stdOutput = proc.stdOut();