Fix: "adb install -s" adaptation for session based install

Internal implementation of "adb install" has been changed to
session install. As a result '-s' option doesn't work.
Size info is required when using '-s' option in session install.
PackageHelper.fitsOnExternal() returns false and moving app to SD is
failed when size info is not set.

So set size info when '-s' option is used.
And change identity on some method because shell doesn't have some
permission to access to asec.

Bug: 29932779
Author: Ryuki Nakamura <ryuki.x.nakamura@sonymobile.com>
Change-Id: I65edcc0f01ceecaaba17792ad329791a9253d603