Refactor couch_httpd_auth's AuthModule construct

We were missing the change necessary to upgrade user documents with the
move to pbkdf2 in a cluster. This also adds the ability for an
AuthModule to return a context that will be used when updating user
credentials.

COUCHDB-2491
3 files changed
tree: 1a4d442024bdc75011c153d976bf7a6c300b201f
  1. include/
  2. priv/
  3. src/
  4. test/
  5. .gitignore
  6. rebar.config.script