Added memory/cpu variables for libvirt

[e-minguez]

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[abhinavdahiya]

@e-minguez any reason why the defaults are not enough? OR why you would want to change these values?

[eparis]

we actually ripped these out a while ago...

[wking]

Cross linking #163, where we switched to the current hardcoded approach.

[crawford]

We can re-open this if there is a good justification.

/close

[openshift-ci-robot]

@crawford: Closing this PR.

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In response to this:

We can re-open this if there is a good justification.

/close

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