debugger: unify naming of sysroot related variables and function

Change-Id: I77dd74ba7260622d9fec6cfca4a06d0f817495d8
Reviewed-on: http://codereview.qt.nokia.com/212
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggerstartparameters.h

@@ -107,7 +107,7 @@ public:
     QString symbolFileName;
     bool useServerStartScript;
     QString serverStartScript;
-    QString sysRoot;
+    QString sysroot;
     QByteArray remoteDumperLib;
     QByteArray remoteSourcesDir;
     QString remoteMountPoint;