Fix passing of HostConfig on start

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
Merge pull request #130 from LK4D4/fix_hostconfig_pass

Fix passing of HostConfig on start
Fix unit tests for simplebridge

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Schema: a new package in simplebridge for managing the state schema.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
add DummySandbox to tests, remove nil checking from ep.configure

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)