syslog_format was a downstream-only RHEL patch against aide 0.16 that
was lost during the rebase to 0.19.2. Users with syslog_format=yes in
their config received a fatal parse error (exit code 17) after upgrade.
Re-implements the option as REPORT_FORMAT_SYSLOG using the 0.19.2
report format module system rather than the old standalone boolean,
fitting the new architecture cleanly. syslog_format=yes/true is
equivalent to report_format=syslog; both spellings are accepted.
Resolves: RHEL-178317
Signed-off-by: Cropi <alakatos@redhat.com>
