JIRA: https://jira.spring.io/browse/INT-3933
Previously the HTTP and WS Inbound Endpoint haven't handled the `stopped` state properly.
* Add `lifecycle` parsing to the `HttpInboundEndpointParser`
* Handle `!isRunning()` state and throw an appropriate `503 Service Unavailable` HTTP response
* Expose `lifecycle` options for the `<int-ws:inbound-gateway>`
* Introduce `ServiceUnavailableException` `WebServiceException` to indicate `stopped` state for the WS Inbound Endpoint
* Fix tests for the new logic
INT-3933: PR comments: `OrderlyShutdownCapable` for `AbstractWebServiceInboundGateway`
c0784bf6ef