refactor(plugins): Improved and simplified verifier and plugin list#313

Merged

knative-prow-robot merged 8 commits intoknative:masterfrom

rhuss:pr/plugin-improvements

Aug 8, 2019

Commits on Aug 8, 2019

refactor(plugins): Split up some methods in plugin_verifier to make them shorter
rhuss
committed
fix: Tuned `plugin list` for better handling when no plugin directory exists
rhuss
committed