NETCONF device is disconnected, as yangtools has issues to dynamically load OpenConfig models

When enabling OpenConfig support on my IP/MPLS router, NETCONF connection is terminated. Getting the following errors:

2017-09-08 08:25:56,522 | WARN | sing-executor-33 | NetconfDevice | 306 - org.opendaylight.netconf.sal-netconf-connector - 1.5.0.Carbon | RemoteDevice

{VSR}: Unable to build schemacontext, unsatisfied imports {}, will reattempt with resolved only
2017-09-08 08:25:56,522 | ERROR | sing-executor-33 | NetconfDevice | 306 - org.opendaylight.netconf.sal-netconf-connector - 1.5.0.Carbon | RemoteDevice{VSR}

: Initialization in sal failed, disconnecting from device
java.lang.IllegalStateException: RemoteDevice

{VSR}: No more sources for schema context
at org.opendaylight.netconf.sal.connect.netconf.NetconfDevice$SchemaSetup.setUpSchema(NetconfDevice.java:502)[306:org.opendaylight.netconf.sal-netconf-connector:1.5.0.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.NetconfDevice$SchemaSetup.run(NetconfDevice.java:445)[306:org.opendaylight.netconf.sal-netconf-connector:1.5.0.Carbon]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[:1.8.0_131]
at java.util.concurrent.FutureTask.run(Unknown Source)[:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[:1.8.0_131]
at java.lang.Thread.run(Unknown Source)[:1.8.0_131]
2017-09-08 08:25:56,537 | WARN | sing-executor-33 | NetconfDeviceCommunicator | 306 - org.opendaylight.netconf.sal-netconf-connector - 1.5.0.Carbon | RemoteDevice{VSR}

: Session terminated Session closed

Behavior is a bit surprising: I get the log "unsatisfied imports {}", where the list of unsatisfied imports is empty. Also, if there are unsatisfied imports typically ODL does not terminate the NETCONF connection - but just ignores the corresponding models. So this is likely a bug in the yang parser causing this issue.