Check WaitTimeout return in test, replaced lock initialization in runtime.Register() with call to initLock()

Moved resetLock() to the Load() method ; changed resetLock() to initLock() and changed behavior to not modify the lock if it was already set (not nil)

use setStopped() during the restore step

Show shorthand container IDs for convenience. Shorthand IDs (or any non-conflicting prefix) can be used to lookup containers

runtime.Create receives an image name + Config. The Config includes all required runtime information: command, environment, ports etc.