Agent crashes when router pod is deleted

Same observation as in #715 that the admin pod crashes when router pod crashes. In this case though, the router pod is just deleted manually.

The openshift logs for the agent container shows this error:

2018-01-23T09:21:52.367Z agent info retrieved link routes for Router.qdrouterd-2217381788-s3srf: raw-> [{"name":"override.lwt_in","identity":"4","type":"org.apache.qpid.dispatch.router.config.linkRoute","prefix":"$lwt","distribution":"linkBalanced","connection":null,"containerId":"lwt-service","dir":"in","operStatus":"inactive","pattern":null},{"name":"override.lwt_out","identity":"5","type":"org.apache.qpid.dispatch.router.config.linkRoute","prefix":"$lwt","distribution":"linkBalanced","connection":null,"containerId":"lwt-service","dir":"out","operStatus":"inactive","pattern":null},{"name":"override.locate","identity":"6","type":"org.apache.qpid.dispatch.router.config.linkRoute","prefix":"locate","distribution":"linkBalanced","connection":"subscription-service","containerId":null,"dir":"out","operStatus":"inactive","pattern":null}]
2018-01-23T09:21:52.367Z agent info retrieved link routes for Router.qdrouterd-2217381788-s3srf: {}
2018-01-23T09:21:52.367Z agent info updating addresses for Router.qdrouterd-2217381788-s3srf
2018-01-23T09:21:52.367Z agent info checking connectivity for Router.qdrouterd-2217381788-s3srf
2018-01-23T09:21:52.367Z agent info checking connectors on router Router.qdrouterd-2217381788-s3srf, missing=, stale=
2018-01-23T09:22:20.264Z agent info router ready
2018-01-23T09:22:20.264Z agent info router ready
events.js:160
      throw er; // Unhandled 'error' event
      ^
Error: Node not found
    at Sender.link.on_detach (/opt/app-root/src/node_modules/rhea/lib/link.js:146:86)
    at Session.on_detach (/opt/app-root/src/node_modules/rhea/lib/session.js:647:27)
    at Connection.(anonymous function) [as on_detach] (/opt/app-root/src/node_modules/rhea/lib/connection.js:646:30)
    at c.dispatch (/opt/app-root/src/node_modules/rhea/lib/types.js:902:33)
    at Transport.read (/opt/app-root/src/node_modules/rhea/lib/transport.js:95:36)
    at SaslClient.read (/opt/app-root/src/node_modules/rhea/lib/sasl.js:252:26)
    at Connection.input (/opt/app-root/src/node_modules/rhea/lib/connection.js:424:35)
    at emitOne (events.js:96:13)
    at TLSSocket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)

EnMasseProject / enmasse

Agent crashes when router pod is deleted #781