libct: add/use configs.HasHook #4433
                
     Merged
            
            
          
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libct: add/use configs.HasHook
This allows to omit a call to c.currentOCIState (which can be somewhat
costly when there are many annotations) when the hooks of a given kind
won't be run.
libct: don't pass SpecState to init unless needed
SpecState field of initConfig is only needed to run hooks that are
executed inside a container -- namely CreateContainer and
StartContainer.
If these hooks are not configured, there is no need to fill, marshal and
unmarshal SpecState.