USHIFT-4349: Fixed --osinfo=generic warning

[vanhalenar]

virt-install can't detect the OS automatically, most likely because we're building the images ourselves, therefore the OS needs to be specified manually.

[openshift-ci-robot]

@vanhalenar: This pull request references USHIFT-4349 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.18.0" version, but no target version was set.

In response to this:

virt-install can't detect the OS automatically, most likely because we're building the images ourselves, therefore the OS needs to be specified manually.

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[ggiguash]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, vanhalenar

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[openshift-ci]

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