re-enabled ReposListPreservesManualEditsToEnablementOfRedhatRepos_Test
re-enabled
YumRepoListPreservesAdditionalOptionsToRedhatReposUsingManualEdits_Test

added
YumRepoListPreservesAdditionalOptionsToRedhatReposUsingManualEditsButRepoOverridesTakePrecedence_Test
reduced the execution time of ReposEnable_Test and ReposDisable_Test