Add support for Liebert/Emerson/Vertivco CRV in row cooling units.

[mnmsrt8]

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• [x ] Is your install up to date? Updating your install
  Please do not submit an issue if your install is not up to date within the last 24 hours or on a stable monthly release.

• [x ] Please include all of the information between the ==================================== section of ./validate.php.
  Component | Version
  --------- | -------
  LibreNMS | 5ad8fd3
  DB Schema | 152
  PHP | 7.0.14
  MySQL | 5.5.54
  RRDTool | 1.4.7
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• [ x] If you would like us to add a new device or your device is listed as Generic then please provide the information asked for here

crv_poller.txt
crv_snmpbulkwalk.txt
crv_discovery.txt

MIB Download: http://downloads2.vertivco.com/RackPDU/MPX/MIB/v12.3/LgpMibDistribution_12.3_00009.zip
These are generic MIBs for Liebert (including PDU, Racks, Cooling and other)

• [x ] Please provide as much detail as possible.
  I would like to have the CRV in row cooling units added as devices. Default graphs would be supply air, return air, humidity, percentage of fan use, and cooling capacity. Adding in the option to have a rotation option for the units as well. This could be done via the maintenance windows. Sometimes more than one is used, and they cycle.

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