Interface for actors registries.
        
        
Methods
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lookupActor(handle [, creds])
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Parameters:
Name Type Argument Description handlestring Actor handle from the authenticator. credsstring <optional> 
Registry-specific actor credentials, if any. Returns:
Actor record or a promise of it. Returningnullor a promise that resolves to anullmeans the actor does not exist for the handle. Ifcredsis provided, may also mean that the credentials are invalid. If a promise is returned and the promise is rejected, it indicates an unexpected internal error.- Type
 - module:x2node-common.Actor | Promise.<module:x2node-common.Actor>