gem development dependencies are treated as runtime dependencies

1. publish a gem with dev dependencies to nx3 hosted repo
2. when you install the gem from the hosted repo, nx3 reports the dev dependencies as main dependencies (downloads them when it should not ) - this is different than how rubygems.org and nexus 2 works

Ruby gems dependency metadata returned from /api/v1/dependencies incorrectly identifies development dependencies as runtime dependencies - this can cause builds to fail due to conflicts resolving dependency versions.

Expected

• make Nexus 3 treat dev dependencies like rubygems.org and nexus 2 do