Test fix for RHEL with alternatives

Alternatives support was added in #89, but the test wasn't updated to
expect failures when invalid alternatives are passed to RHEL systems.
Merge pull request #94 from mhaskel/test_fix_89

Test fix for RHEL with alternatives
Sync with modulesync
Merge pull request #95 from cmurphy/master

Sync with modulesync
Acceptance test fix for wheezy
Merge pull request #96 from mhaskel/wheezy_test_fix

Acceptance test fix for wheezy