It looks like the failure is due to check-dockerhub-dockerfile-version. This check always fails during development or release:prepare -DdryRun, because it relies on tags and version numbers that are only available when we are making a release for real. I committed a fix for CALCITE-2385  to fix this. I am not able to update the CI configuration for Jenkins, but can someone update it to include the -DskipDockerCheck argument to fix it?
For Travis, the cause of the test failures is also the same and I updated the .travis.yml file to fix it.