sal-binding-broker-impl times out waiting for ClassLoadingStrategy

I'm seeing periodic SingleFeatureTest hangs in autorelease that seem to all trace back to this root issue:

2017-05-01 10:44:13,976 | ERROR | rint Extender: 1 | BlueprintContainerImpl | 12 - org.apache.aries.blueprint.core - 1.7.1 | Unable to start blueprint container for bundle org.opendaylight.controller.sal-binding-broker-impl/1.5.0.Carbon due to unresolved dependencies [(objectClass=org.opendaylight.mdsal.binding.generator.api.ClassLoadingStrategy)]
java.util.concurrent.TimeoutException
at org.apache.aries.blueprint.container.BlueprintContainerImpl$1.run(BlueprintContainerImpl.java:371)[12:org.apache.aries.blueprint.core:1.7.1]

I'm not sure what is causing this, but between this and BUG-8335, they amount for the vast majority of autorelease failures at the moment.