Update to WildFly 10 (ready for EAP 7)

Most of the work is already done in https://github.com/zanata/zanata-server/pull/990

The main thing left is to decide what to do about the jboss-cli script (etc/scripts/standalone.cli.messaging.config) and the corresponding instructions (docs/user-guide/system-admin/configuration/jms-messaging.md) - either they should be removed as redundant and obsolete, or else they must be updated to support the new messaging subsystem used in WildFly 10.