Add the special agent agent_hivemanager_ng and the corresponding check
hivemanager_ng_devices. Together they can be used to monitor devices
in the Aerohive HiveManager NG cloud.
Setup of the special agent is possible via the WATO rule "Aerohive
HiveManager NG". For each device one check is created. The devices
can be configured via the WATO rule "HiveManager NG Devices".
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