Add --batch --yes to gpg command.

If you want to resign the file and signature files exists, gpg tool
will ask a question.

Added --batch --yes to avoid the input from a user.

Change-Id: Ie7ae74c900f9856c3fdbcbd7ebf2613bff16cfd0
Signed-off-by: Kiril Nesenko <knesenko@redhat.com>