Fix force-new-cluster
Fix force-new-cluster

- Don’t setup new CA, it can be recovered from state.
- Fix attempt to join empty address.

Signed-off-by: Tonis Tiigi <c2470c48b2d3312d61f94f18d3a1cd113d1915ad@gmail.com>
cheyang/swarmkit,cheyang/swarmkit,dperny/swarmkit-1,Noyan759/swarmkit,Noyan759/swarmkit,runshenzhu/swarmkit,RenaudWasTaken/swarmkit,aaronlehmann/swarmkit,RenaudWasTaken/swarmkit,alyyousuf7/swarmkit,fate-grand-order/swarmkit,AliyunContainerService/swarmkit,yp-engineering/swarmkit,diogomonica/swarmkit,aaronlehmann/swarmkit,alyyousuf7/swarmkit,deljuven/swarmkit,elifa/swarmkit,sungwonh/swarmkit,cezarsa/swarmkit,yp-engineering/swarmkit,sungwonh/swarmkit,cezarsa/swarmkit,deljuven/swarmkit,AliyunContainerService/swarmkit,runshenzhu/swarmkit,yongtang/swarmkit,diogomonica/swarmkit,jlhawn/swarmkit,elifa/swarmkit,vasil-yordanov/swarmkit,allencloud/swarmkit,docker/swarmkit,fate-grand-order/swarmkit,vasil-yordanov/swarmkit,yongtang/swarmkit,jlhawn/swarmkit,dperny/swarmkit-1,allencloud/swarmkit,docker/swarmkit