SSH: Derive SshRemoteProcess from QIODevice.

Now it looks even more like QProcess. Things like process channels are
still missing.

Change-Id: I3f30cd00ed4a054d02e83add9a6f4162b48f8345
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>

src/plugins/remotelinux/linuxdevicetester.cpp

@@ -106,7 +106,7 @@ void GenericLinuxDeviceTester::stopTest()
         d->portsGatherer.stop();
         break;
     case RunningUname:
-        d->process->closeChannel();
+        d->process->close();
         break;
     case Inactive:
         break;