Eric Newton, did you clean up your working directory before building? The line that is failing references o.a.a.core.Constants.METADATA_TABLET_COLUMN_FAMILY. That field exists in 1.4.x, but does not in 1.6.0-SNAPSHOT+. So it looks like your classpath is getting a 1.6.x version of that file and a 1.4.x version of o.a.a.server.util.Initialize.
Could you try running `git clean -xdf` and then rebuilding and rerunning?
Also note that as of the patch attached, building requires specifying both the hadoop profile and the hadoop version:
$> mvn -Dhadoop.profile=2.0 -Dhadoop.version=2.2.0 clean package && mvn -Dhadoop.profile=2.0 -Dhadoop.version=2.2.0 assembly:single -N