Revert "Reapply "Enable CPU power management by default for libvirt compute""

[gibizer]

This reverts commit 41497aa.

[openshift-ci]

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[SeanMooney]

we found 2 new bugs in the power managment feature when trying to enable whitebox testing.

one is related to live migation and the other to the isolate emulator threads policy.

as a result we are goign to hold off on enabling htis by default until we can fix that

[openshift-ci]

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This pull-request has been approved by: gibizer, SeanMooney

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