utils.vmimage: Use set to store providers
The IMAGE_PROVIDERS stores possible classes to provide images, let's
avoid unnecessary multiple occurrences.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>
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The IMAGE_PROVIDERS stores possible classes to provide images, let's
avoid unnecessary multiple occurrences.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>