ConcurrentModificationException observed when installing bgpcep (master branch)

steps to reproduce it:
-run Karaf
-install -> feature:install odl-restconf odl-bgpcep-bgp

2016-09-22 16:32:50,282 | WARN | r - ConfigPusher | FeatureConfigPusher | 137 - config-persister-feature-adapter - 0.6.0.SNAPSHOT | Karaf featuresService.listInstalledFeatures() has thrown an exception, retry 0
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)[:1.8.0_101]
at java.util.HashMap$KeyIterator.next(HashMap.java:1461)[:1.8.0_101]
at java.util.AbstractCollection.toArray(AbstractCollection.java:196)[:1.8.0_101]
at org.apache.karaf.features.internal.FeaturesServiceImpl.listInstalledFeatures(FeaturesServiceImpl.java:840)[20:org.apache.karaf.features.core:3.0.8]
at Proxy9faf1ce0_0954_4724_860e_acc04c402866.listInstalledFeatures(Unknown Source)[:]
at org.opendaylight.controller.configpusherfeature.internal.FeatureConfigPusher.isInstalled(FeatureConfigPusher.java:96)[137:config-persister-feature-adapter:0.6.0.SNAPSHOT]
at org.opendaylight.controller.configpusherfeature.internal.FeatureConfigPusher.pushConfig(FeatureConfigPusher.java:77)[137:config-persister-feature-adapter:0.6.0.SNAPSHOT]
at org.opendaylight.controller.configpusherfeature.internal.FeatureConfigPusher.pushConfigs(FeatureConfigPusher.java:67)[137:config-persister-feature-adapter:0.6.0.SNAPSHOT]
at org.opendaylight.controller.configpusherfeature.internal.ConfigPushingRunnable.processFeatureEvent(ConfigPushingRunnable.java:65)[137:config-persister-feature-adapter:0.6.0.SNAPSHOT]
at org.opendaylight.controller.configpusherfeature.internal.ConfigPushingRunnable.run(ConfigPushingRunnable.java:47)[137:config-persister-feature-adapter:0.6.0.SNAPSHOT]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_101]