Update the errNoManager() to conform to `swarm join-token`
Update the errNoManager() to conform to `swarm join-token`

In 24823, `swarm join` has been updated to take a `--token`
flag and flag `--manager` has been removed. Though in errNoManager()
the error message still use the old description.

This fix update the error message in errNoManager() and conforms
to the current available flags.

This fix is related to 24823.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
(cherry picked from commit 3d30155735d572376500729496de657459493213)
Signed-off-by: Tibor Vass <3f1326dff4d85ad4ec938fb33f64575ace96db26@docker.com>

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