Reinstall option of backend

This commit adds "-r" option for xwalkctl.
xwalkctl may be called with this option by package manager to reinstall app in specific way may be implemented later.

For now, we need just to signal pkgmgr that reinstallation fails to prevent hanging requesting process.

TASK=XWALK-2458
Merge pull request #2396 from tiwanek/XWALK-2458

[Tizen] Reinstall option of backend