rpm: Ignore failing createrepo tests.

Change-Id: Ia12e2dbd5acf26ec08dc9e8f118f09b3775bbefd
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/33994
Reviewed-on: https://git.eclipse.org/r/35255
Tested-by: Hudson CI
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>
Tested-by: Jeff Johnston <jjohnstn@redhat.com>