git: openjdk/skara: Allow reverse mapping of census namespace users

[duke]

Changeset: ac12500e
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-09-03 08:48:14 +0000
URL:       https://github.com/openjdk/skara/commit/ac12500e

Allow reverse mapping of census namespace users

Reviewed-by: ehelin

! census/src/main/java/org/openjdk/skara/census/Namespace.java
! census/src/test/java/org/openjdk/skara/census/CensusTests.java