Add swarmkitstate/ and bin/swarmkitstate/ to gitignore
Add swarmkitstate/ and bin/swarmkitstate/ to gitignore

These are obvious locations where swarmkitstate might be created during
testing, but the swarmkitstate should literally never be checked into
verison control, ever, and so shouldn't show up in git status.

Signed-off-by: Drew Erny <83d780db39fae693cf18623ace93c7ec0dc91590@docker.com>

docker/swarmkit,cheyang/swarmkit,deljuven/swarmkit,allencloud/swarmkit,Noyan759/swarmkit,fate-grand-order/swarmkit,diogomonica/swarmkit,jlhawn/swarmkit,dperny/swarmkit-1,elifa/swarmkit,diogomonica/swarmkit,cheyang/swarmkit,jlhawn/swarmkit,docker/swarmkit,sungwonh/swarmkit,fate-grand-order/swarmkit,RenaudWasTaken/swarmkit,dperny/swarmkit-1,RenaudWasTaken/swarmkit,deljuven/swarmkit,AliyunContainerService/swarmkit,alyyousuf7/swarmkit,sungwonh/swarmkit,AliyunContainerService/swarmkit,allencloud/swarmkit,alyyousuf7/swarmkit,Noyan759/swarmkit,elifa/swarmkit