Fixed missing return that broke test discovery.
Also fixed test that would fail on some setups
Fix pkg1 test failures.

Renamed egg test package from pkg1 to pkgegg as the sys.path shenanigans
were making other tests fail.
Fixed eggdiscovery documentation warning
Added eggdiscovery import in test module to prevent Travis failures
Absolute import of discovery module to fix Travis failures
Fixed py3 build
Merge pull request #189 from aloysbaillet/fix_discovery

Fix test discovery