• customData needs to show up in the docco. (It's in the release notes, but
  not mentioned in the PyMongo driver)

The spec says that a user records looks like this:

"Created user <user>@<db> (with|without) password, (with|without) customData,
with the following roles: <role names>."

In practice, there's no comma after password. In this case I think the spec
has better grammar.

More importantly, the spec says that the customData is not included, but the
actual line has it:

2013-10-29T13:55:07.971-0400 admin@admin 127.0.0.1:60257/127.0.0.1:27017
000000000000000000000000.0 Created user user61@db60with password with
customData { custom: "data" }, with the following roles: read@db60.