* Add folder_name alias
The parameter should be named folder_name instead of folder to be
consistent with the other parameters cluster_name and datacenter_name.
* Fix 'A specified parameter was not correct: cnxSpec' error
The play fails when re-connecting a host with the cnxSpec argument
defined.
Just remove the cnxSpec argument definition. It isn't necessary when
re-connecting an existing host in vCenter (6.5).
* Fix ESXi host add/remove/re-connect errors
An ESXi host cannot be added, removed, or re-connected under a folder.
ESXi hosts connected under a folder, instead of a cluster, have an
object type of ComputeResource instead of HostSystem and the HostSystem
object is the first entry in the host parameter list of the
ComputeResource object.
Separate between cluster and folder actions.
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