Adding the destroy field to vsphere-clone and vsphere-iso builders

[DimpleRajaVamsi]

What this PR does / why we need it:
Adding the destroy field to vsphere-clone and vsphere-iso builders so that Packer VM can be deleted after successful VM generation.

Before

    vsphere: Writing ovf...�
==> vsphere: Clear boot order...�
==> vsphere: Running post-processor: packer-manifest (type manifest)

Now after setting the destroy parameter to true

    vsphere-iso.vsphere: Writing ovf...
==> vsphere-iso.vsphere: Clear boot order...
==> vsphere-iso.vsphere: Destroying VM...
==> vsphere-iso.vsphere: Running post-processor: packer-manifest (type manifest)

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1242

Additional context

• Added the destroy to only vsphere-iso (Not applicable for other builders)
• Not to change any existing behaviors destroy parameter value is set to false.

[k8s-ci-robot]

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[randomvariable]

/lgtm
/approve

[k8s-ci-robot]

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[randomvariable]

/ok-to-test

[randomvariable]

/lgtm