Yong Tang a1ee3c9125 Allow swarm join with --availability=drain
This fix tries to address the issue raised in 24596 where it was not
possible to join as manager only (`--availability=drain`).

This fix adds a new flag `--availability` to `swarm join`.

Related documentation has been updated.

An integration test has been added.

NOTE: Additional pull request for swarmkit and engine-api will
be created separately.

This fix fixes 24596.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: f4d26add25
Component: cli
2017-06-02 00:10:48 +00:00
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