1)  On systems running Upstart, shorewall-init cannot reliably secure
    the firewall before interfaces are brought up.

2)  The 'enable', 'reenable' and 'disable' commands do not work
    correctly in configurations with USE_DEFAULT_RT=No and optional
    providers listed in the DUPLICATE column.

3)  When AUTOMAKE=Yes and the 'find' utility is Busybox-based,
    Shorewall 5.1.11 fails during compilation with the error:

        find: unrecognized: -quit

    Workaround: Set AUTOMAKE=No
