agetty: make sure that reload file exists

agetty monitors /run/agetty.reload file, unfortunately if the file
does not exist when agetty starts up then "agetty" --reload does not
work. This patch forces agetty to create the file before inotify
is enabled.

Reported-by: Sitsofe Wheeler <sitsofe@gmail.com>
Signed-off-by: Karel Zak <kzak@redhat.com>