I've observed that the feature bundles will not be loaded when clustering is enabled.  The most likely cause is a recent change to startODL.sh, which added this line:

cat $ODL_HOME/etc/org.apache.karaf.features.cfg | sed -e "\|featuresBoot=config|s|$|,odl-mdsal-clustering,odl-jolokia|" > $ODL_HOME/etc/org.apache.karaf.features.cfg

When this runs, the file /opt/opendaylight/etc/org.apache.karaf.features.cfg is made empty.

To temporarily avoid this issue, clustering is now disabled by default in OOM deployments, see: https://gerrit.onap.org/r/#/c/58081/   This should be reverted once this issue is resolved.