Factor out i18n code and use commons i18n framework

Matthew Swift

16.40.2011 d8bf5464e5ff205ee2304aaddf36fae05a24b154

opendj3/opendj-maven-plugin/src/main/java/org/opendj/buildtools/maven/MessagePropertyKey.java does not exist in tree df8e6123c0510430a07aa9cd3c394932c468db59