Nut upsdev - Jul 2019 - Instant commands for CyberPower UPS RMCARDxxx snmp-ups driver

Hi all,

I've implemented instant commands for CyberPower UPSes controlled via SNMP
<https://github.com/networkupstools/nut/pull/686>.

Commands available:

    shutdown.return
    shutdown.stayoff
    load.off/on
    test.failure.start
    test.panel.start
    test.battery.start
    calibrate.start/stop

ups.delay.shutdown, .reboot, and .start can now be set via SNMP. ups.status has
been updated to be more informative, correctly reporting BOOST, RB, and CAL, and
a bug in the time units reported for battery.runtime has been fixed.

Ross W