Added VM shutdown feature #1394

[aishwarya128]

Description

This feature helps to shutdown/poweroff a running virtual machine in the environment. User can import the deployed virtual machines using terraform configuration file for the existing infra he/she can pass this parameter and poweroff the state.

Release Note

NONE
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### References
https://github.com/hashicorp/terraform-provider-vsphere/issues/1394

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[aishwarya128]

Closing this PR due to some conflict with Github accounts, will be opening another PR with correct Github username.

[github-actions]

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