Exec start was sending HTTP 500 for every error.
Fixed an error where pausing a container and then calling exec start
caused the daemon to freeze.
Updated API docs which incorrectly showed that a successful exec start
was an HTTP 201, in reality it is HTTP 200.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 2d43d93410c29cec87deb9cd940c3b2a8af5fbbb
Component: engine