Werk #7054: agent_vsphere, esx_vsphere_hostsystem.multipath: use new API endpoint

For ESX versions above or equal to 6.5 the API endpoint "multipathState" does not deliver sufficient data for the subcheck esx_vsphere_hostsystem.multipath which may lead to a wrong output of the subcheck. Therefore, the subcheck now uses the "multipathInfo" API endpoint instead.

For ESX versions below 6.5 which already use the ID of a LUN as an item no further actions are necessary. For new ESX version which use an item like e.g. "L0 physical" a service rediscovery is necessary. After the rediscovery new ESX versions will use the ID of a LUN as an item as well.

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