[CRTP infra-vmware connector]Compute: hostname, assign the value on instance system

[cgourdin]

The attribute hostname is not assigned on system when creating an instance from a template, or when calling occiUpdate().

[cgourdin]

If tools are installed use the same technic as user data to update the hostname via VMware tools.
It may have a way to do this with ssh command if we know the target system.