Use registries for authentication backends

Review Request #7785 — Created Nov. 30, 2015 and submitted — Latest diff uploaded

Information

Review Board
release-2.6.x

Reviewers

Authentication backends now use Djblets registries for managing the set
of backends. The external API remains unchanged.

There is now a reviewboard.registries module that contains a
specialized registry that populates from an entry point.

Since registries are in Djblets 0.10.x, this updates Review Board to
depend on that version of Djblets.

  • Ran unit tests.