Reply to javascript dialog when exiting by command |pkgcmd|

Reply to javascript dialog when exiting by command |pkgcmd|

There's an issue not to kill web app when javascript dialog is opened
even if the command |pkgcmd -k -n <pkgid>| is executed to kill the web app.
To prevent the issue, this CL replies to the dialog to close it
right before the termination.

Bug: TSAM-11809, TSAM-11813
Url: http://suprem.sec.samsung.net/jira/browse/TSAM-11809
Url: http://suprem.sec.samsung.net/jira/browse/TSAM-11813

Change-Id: I4757f45b3731d25cb57876f12c7b2e52b9f62af7
Signed-off-by: Youngsoo Choi <kenshin.choi@samsung.com>