Do not shutdown machine on certain changes

[walkamongus]

Is your feature request related to a problem? Please describe.
Nutanix supports hot-plugging for things like CPU and memory, but currently changing this will result in a VM reboot/interruption.

Describe the solution you'd like
Certain changes to the VM (CPU and memory) should not initiate a shutdown/reboot.

Describe alternatives you've considered
I don't think there is an alternative in this particular case.

[walkamongus]

update shutdown code is at https://github.com/terraform-providers/terraform-provider-nutanix/blob/master/nutanix/resource_nutanix_virtual_machine.go#L984

[Jorge-Holgado]

Good afternoon,
I've done a little patch on the provider in my fork:
https://github.com/Jorge-Holgado/terraform-provider-nutanix

Options that will be hot-plug (always):

• name
• description
  Options hot-plug just when increasing it:
• num_vcpus_per_socket
• num_sockets
• memory_size_mib

You're right with the function location and the poweroff option, but there are some issues that I think I've solved. Give it a try and tell me if you have any issue.

[marinsalinas]

@Jorge-Holgado could you please open a PR with these changes?

[Jorge-Holgado]

@marinsalinas : Done!