client timeouts are propagating an mi_result for timeout that is not a valid result

[paulcallen]

we have an internal mi_result that should not be exposed directly to the client. instead we need to create a CIM_Error object with the correct category stating it is a timeout, and the actual mi_result will be an mi_result_failed.
NOTE: When this changes the powershell remoting client will need to be updated otherwise it will be completely broken with its Receive processing which relies on Timeout requests from the server.