when loading these feature:
odl-integration-compatible-with-all,odl-vtn-manager-rest,odl-vtn-manager-neutron

the following message is seen in karaf.log for over 30 minutes. It does finally appear to finish. here are the two relevant log file lines:

2016-02-10 17:39:29,430 | WARN | ction-692-694'}} | DeadlockMonitor | 92 - org.opendaylight.controller.config-manager - 0.4.0.SNAPSHOT | ModuleIdentifier

{factoryName='snmp-impl', instanceName='snmp-impl'}

did not finish after 1885794 ms
2016-02-10 17:39:30,034 | INFO | config-pusher | ConfigPusherImpl | 96 - org.opendaylight.controller.config-persister-impl - 0.4.0.SNAPSHOT | Successfully pushed configuration snapshot snmp-impl.xml(odl-snmp-plugin,odl-snmp-plugin)

This is using a distribution built from stable/beryllium on Feb,10,2016