vSphere: Implement Close() to log out and shutdown idle connections

[mansam]

Signed-off-by: Sam Lucidi slucidi@redhat.com

[kubevirt-bot]

@mansam: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fdupont-redhat, jakub-dzon, mansam
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[kubevirt-bot]

@mansam: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-vm-import-operator-e2e-k8s-1.18	ed9cf10	link	/test pull-vm-import-operator-e2e-k8s-1.18

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