Tonis Tiigi 5c10897dd4 Fix race on clearing swarm nodes on stop
On stop there were multiple places that marked
`cluster.node` nil. Now stop waits for the node to
set itself nil.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Upstream-commit: 1a8a473017299c5e999d55d14634874826062fce
Component: engine
2016-06-24 13:57:02 -07:00
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