BUG/MEDIUM: checks: Avoid having an associated server for email checks.

When using a check to send email, avoid having an associated server, so that
we don't modify the server state if we fail to send an email.
Also revert back to initialize the check status to HCHK_STATUS_INI, now that
set_server_check_status() stops early if there's no server, we shouldn't
get in a mail loop anymore.

This should be backported to 1.9.
1 file changed