The patch looks good to me, a few minor issues:
There was an issue I noticed with the license file being spec'd wrong (that's legacy though, so an old bug). This latest patch fixes that as well.
I also added some detail to the readme about what to expect from the build artifacts (the jars).
Thomas – the pom does not need to be signed? (minor nit, you should name the patches after the JIRA (makes our lives easier - committers/reviewers) and also you can just upload a new patch with the same name, don't delete the old one, jira will handle it correctly, allows us to see old versions)
ZOOKEEPER_537.patch obsoletes build.patch.