gpg: Ignore KEY_CONSIDERED line introduced in gpg 2.1.13

gpg 2.1.13 introduced a new status line, KEY_CONSIDERED:
https://lists.gnupg.org/pipermail/gnupg-announce/2016q2/000390.html
gpgme 1.7.0 supported it:
https://lists.gnupg.org/pipermail/gnupg-commits/2016-May/012130.html

The line seems innocent in the sense that it tells you what keys GnuPG
looked at without doing anything.  We can probably safely ignore that
line, as we ignore many other lines already.

https://bugzilla.gnome.org/show_bug.cgi?id=778607



Signed-off-by: Stef Walter <stefw@redhat.com>
 * Fixed this so it compiles