During the refactoring for 18.09 the activate/update flows no longer
restart the engine explicitly but let the user do that when they're ready,
so the health check logic is no longer required.
Signed-off-by: Daniel Hiltgen <daniel.hiltgen@docker.com>
(cherry picked from commit f2b2061cc38995a4d16659787d80563d8ec669d0)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>