APPC receives restart action request from Policy for vCPE closed loop, but fails internally to restart vGMUX. See log snippet: 

2018-11-15T15:44:37,438 | INFO  | qtp710281632-386754 | metrics                          | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | APPC0128I Operation "DEFAULT" for VNF type "null" from Source "appc" with RequestID "12700990-0c41-49cc-9225-94c15b3ebdb7" on "A&AI" with action "query" ended in 345 ms with result "COMPLETE"2018-11-15T15:44:37,438 | INFO  | qtp710281632-386754 | metrics                          | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | APPC0128I Operation "DEFAULT" for VNF type "null" from Source "appc" with RequestID "12700990-0c41-49cc-9225-94c15b3ebdb7" on "A&AI" with action "query" ended in 345 ms with result "COMPLETE"2018-11-15T15:44:37,439 | INFO  | qtp710281632-386754 | RequestValidatorImpl             | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | AAIResponse: SUCCESS2018-11-15T15:44:37,481 | DEBUG | qtp710281632-386754 | RequestValidatorImpl             | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | Current lock owner is null for vnf 6d39b92c-5cbd-4d19-8617-2b17ecbd90d82018-11-15T15:44:37,481 | INFO  | qtp710281632-386754 | WorkFlowManagerImpl              | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | DG resolver configuration data has expired - initiating refresh2018-11-15T15:44:37,484 | ERROR | qtp710281632-386754 | WorkFlowManagerImpl              | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | Error querying workflow from databasenull2018-11-15T15:44:37,484 | ERROR | qtp710281632-386754 | AbstractRequestHandlerImpl       | 446 - appc-common-bundle - 1.4.1.SNAPSHOT | Exception : nulljava.lang.IllegalStateException: null at org.onap.appc.workflow.impl.WorkflowResolverDataReader.read(WorkflowResolverDataReader.java:121) [530:appc-workflow-management-core:1.4.1.SNAPSHOT] at org.onap.appc.workflow.impl.WorkflowResolver.createResolver(WorkflowResolver.java:51) [530:appc-workflow-management-core:1.4.1.SNAPSHOT] at org.onap.appc.workflow.impl.WorkflowResolver.resolver(WorkflowResolver.java:98) [530:appc-workflow-management-core:1.4.1.SNAPSHOT] at org.onap.appc.workflow.impl.WorkflowResolver.resolve(WorkflowResolver.java:136) [530:appc-workflow-management-core:1.4.1.SNAPSHOT] at org.onap.appc.workflow.impl.WorkFlowManagerImpl.workflowExists(WorkFlowManagerImpl.java:204) [530:appc-workflow-management-core:1.4.1.SNAPSHOT] at Proxy73ded469_803c_4304_8785_ee365ed99279.workflowExists(Unknown Source) [?:?] at Proxya6907a62_d70e_45f8_9d94_66ebe356fb25.workflowExists(Unknown Source) [?:?] at org.onap.appc.requesthandler.impl.RequestValidatorImpl.checkWorkflowExists(RequestValidatorImpl.java:488) [528:appc-request-handler-core:1.4.1.SNAPSHOT] at org.onap.appc.requesthandler.impl.RequestValidatorImpl.validateRequest(RequestValidatorImpl.java:213) [528:appc-request-handler-core:1.4.1.SNAPSHOT] at org.onap.appc.requesthandler.impl.AbstractRequestHandlerImpl.handleRequest(AbstractRequestHandlerImpl.java:153) [528:appc-request-handler-core:1.4.1.SNAPSHOT] at Proxy3f399a0e_30fc_41aa_9aa5_8b6b9c416d72.handleRequest(Unknown Source) [?:?] at org.onap.appc.provider.lcm.service.RequestExecutor.executeRequest(RequestExecutor.java:84) [536:org.onap.appc.provider-bundle:1.4.1.SNAPSHOT] at org.onap.appc.provider.AppcProviderLcm.executeRequest(AppcProviderLcm.java:1181) [536:org.onap.appc.provider-bundle:1.4.1.SNAPSHOT] at org.onap.appc.provider.AppcProviderLcm.restart(AppcProviderLcm.java:197) [536:org.onap.appc.provider-bundle:1.4.1.SNAPSHOT] at org.opendaylight.yangtools.yang.binding.util.RpcMethodInvokerWithInput.invokeOn(RpcMethodInvokerWithInput.java:32) [330:org.opendaylight.mdsal.yang-binding:0.12.3] at org.opendaylight.yangtools.yang.binding.util.AbstractMappedRpcInvoker.invokeRpc(AbstractMappedRpcInvoker.java:53) [330:org.opendaylight.mdsal.yang-binding:0.12.3] at org.opendaylight.controller.md.sal.binding.impl.BindingDOMRpcImplementationAdapter.invoke(BindingDOMRpcImplementationAdapter.java:83) [254:org.opendaylight.controller.sal-binding-broker-impl:1.7.3] at org.opendaylight.controller.md.sal.binding.impl.BindingDOMRpcImplementationAdapter.invokeRpc(BindingDOMRpcImplementationAdapter.java:70) [254:org.opendaylight.controller.sal-binding-broker-impl:1.7.3] at org.opendaylight.controller.md.sal.dom.broker.impl.GlobalDOMRpcRoutingTableEntry.invokeRpc(GlobalDOMRpcRoutingTableEntry.java:41) [257:org.opendaylight.controller.sal-broker-impl:1.7.3] at org.opendaylight.controller.md.sal.dom.broker.impl.DOMRpcRoutingTable.invokeRpc(DOMRpcRoutingTable.java:178) [257:org.opendaylight.controller.sal-broker-impl:1.7.3] at org.opendaylight.controller.md.sal.dom.broker.impl.DOMRpcRouter.invokeRpc(DOMRpcRouter.java:102) [257:org.opendaylight.controller.sal-broker-impl:1.7.3]