* vmware_guest: various fixes, improvements & additions
* Add template_flag attribute to define if the destination machine is a
template
* Add helper class to create:
* SCSI controller
* Disks
* Network devices
* New feature: create VM without using templates
* New feature: multiple NIC
* New feature: multiple disks
* New feature: custom SCSI controller types (default: paravirtual)
* New feature: NIC can now be E1000 or VMXNet3 (default)
* New feature: customize NIC mac address
* New feature: new disk option autoselect_datastore permit to select the less used datastore. If datastore field is provided, filter the datastore list before selection
* New feature: Implement disk resizing + addition when state=present and VM exists
* New feature: when state=present and vm exists, modify the current CPU, Memory and disk space
* New feature: add guest_id support permitting to customize & change current VM guest ID in VMWare
* New feature: resource pool support
* New feature: change VM configuration without recreating it (CPU, memory, disks, network, guest ID, resource pool)
* Add 'gatherfacts' state to gather facts on a VM instead of previous 'present' state ('present' ensure the VM configuration)
* Add PyVmomiCache class to cache read only object
* Various python code fixes
* Various documentation fixes
* esxi_hostname & cluster are now exclusive
* Drop ips attribute & set ip directly into networks
* Little performance fixes by removing some duplicate calls to VMWare API
* Python 3 portability fixes
* Create many functions to make the code maintainable
* Cleanup some useless attributes
* Add 'suspended' as desired state for VM
* Make guest_id, memory & CPU number optional in reconfiguration mode
* Note: guest_id is now mandatory to create a VM from scratch (not templating)
* Bux fixes + Do network IP optinal + Add network vlan option
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