By default, OfflineIMAP catches SIGTERM/SIGHUP/SIGINT and attempts to
gracefully terminate as soon as possible. Allow the user to abort
immediately, by hitting Ctrl-C several times.
Bug-Debian: https://bugs.debian.org/679975
Signed-off-by: Ilias Tsitsimpis <i.tsitsimpis@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>