Updated ReleaseTests for changes to stdout/stderr/exitCodes from
bug 1119688 commit df95529a5edd0be456b3528b74344be283c4d258
when the modifiedPools is empty, inserted a call to Skip
VerifyContentLabelForModifierSubscriptionIsOnlyAvailableInYumRepoListAfterTheModifiesPoolIsSubscribed_Test
added a 502 Proxy warning TODO to getResourceUsingRESTfulAPI()