LLDP link provider causing device listener queue timeouts

Processing of device events in the LLDP link provider takes place on the device event dispatch thread. This can access stores and cause timeouts, and disrupt processing of device events for other providers.

2016-06-09 16:21:39,751 | ERROR | nos-shared-timer | ListenerRegistry | 74 - org.onosproject.onos-api - 1.6.0.SNAPSHOT | Listener org.onosproject.provider.lldp.impl.LldpLinkProvider$InternalDeviceListener exceeded execution time limit: 5088 ms; ejected
2016-06-09 16:21:39,767 | WARN | event-dispatch-0 | ListenerRegistry | 74 - org.onosproject.onos-api - 1.6.0.SNAPSHOT | Exception encountered while processing event DeviceEvent{time=2016-06-09T16:21:34.661, type=DEVICE_ADDED, subject=DefaultDevice{id=of:0000000000000008, type=SWITCH, manufacturer=Nicira, Inc., hwVersion=Open vSwitch, swVersion=2.5.0, serialNumber=None, driver=}}
java.lang.RuntimeException: Interrupted
at org.onlab.util.Tools.randomDelay(Tools.java:411)
at org.onlab.util.RetryingFunction.apply(RetryingFunction.java:57)
at org.onosproject.store.config.impl.DistributedNetworkConfigStore.getConfig(DistributedNetworkConfigStore.java:221)
at org.onosproject.net.config.impl.NetworkConfigManager.getConfig(NetworkConfigManager.java:203)
at org.onosproject.provider.lldp.impl.LldpLinkProvider.isBlacklisted(LldpLinkProvider.java:399)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider.isBlacklisted(LldpLinkProvider.java:407)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider.updatePort(LldpLinkProvider.java:471)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider.lambda$updatePorts$5(LldpLinkProvider.java:453)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at java.lang.Iterable.forEach(Iterable.java:75)[:1.8.0_91]
at org.onosproject.provider.lldp.impl.LldpLinkProvider.updatePorts(LldpLinkProvider.java:453)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider.access$1000(LldpLinkProvider.java:97)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider$InternalDeviceListener.lambda$event$0(LldpLinkProvider.java:583)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at java.util.Optional.ifPresent(Optional.java:159)[:1.8.0_91]
at org.onosproject.provider.lldp.impl.LldpLinkProvider$InternalDeviceListener.event(LldpLinkProvider.java:583)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.provider.lldp.impl.LldpLinkProvider$InternalDeviceListener.event(LldpLinkProvider.java:566)[169:org.onosproject.onos-providers-lldp:1.6.0.SNAPSHOT]
at org.onosproject.event.ListenerRegistry.process(ListenerRegistry.java:66)[74:org.onosproject.onos-api:1.6.0.SNAPSHOT]
at org.onosproject.event.impl.CoreEventDispatcher$DispatchLoop.process(CoreEventDispatcher.java:145)[76:org.onosproject.onos-core-net:1.6.0.SNAPSHOT]
at org.onosproject.event.impl.CoreEventDispatcher$DispatchLoop.run(CoreEventDispatcher.java:128)[76:org.onosproject.onos-core-net:1.6.0.SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_91]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_91]
at java.lang.Thread.sleep(Native Method)[:1.8.0_91]
at org.onlab.util.Tools.randomDelay(Tools.java:409)