Fix save vCenter credentials functionality

[pcbailey]

This PR fixes an issue where vCenter credentials are not saved unless the create VM wizard is completed, regardless of success or failure. These changes cause the kubevirt.io/temporary label to be removed from the secret if the "Remember vCenter credentials" box is checked and adds the label with a value of true if the "Remember vCenter credentials" box is unchecked; however, these changes are only made if the connection check is successful.

Bug: https://bugzilla.redhat.com/1714004

Depends on: kubevirt/web-ui#399

Original PR: #489

[coveralls]

Pull Request Test Coverage Report for Build 1753

• 26 of 44 (59.09%) changed or added relevant lines in 7 files are covered.
• 53 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-1.3%) to 81.434%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/k8s/requests/v2v/createV2VvmwareObject.js	0	1	0.0%
src/k8s/requests/v2v/importVmware.js	0	4	0.0%
src/components/Wizard/CreateVmWizard/stateUpdate/providers/vmWareStateUpdate.js	9	22	40.91%

Files with Coverage Reduction	New Missed Lines	%
src/k8s/util/utils.js	2	60.0%
src/k8s/objects/v2v/vmware/vmWareSecret.js	4	9.09%
src/k8s/request.js	5	80.97%
src/k8s/requests/v2v/utils.js	8	5.0%
src/k8s/requests/v2v/importVmware.js	34	9.59%

Totals
Change from base Build 2027:	-1.3%
Covered Lines:	3882
Relevant Lines:	4559

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💛 - Coveralls

[mareklibra]

This backport comes without snapshots from #489.
As activity on the stable branch is getting lower and lower and bug-fix release is requested to be asap, let's accept that.