. Refine code for b10-cmdctl.
. Add value type check according module specification.
. Add return code for RESTful API document of b10-cmdctl.
. Add more unit tests for b10-cmdctl.
. Update man page for b10-cmdctl?

. Add id to each command, so the receiver knows if the response is what it wants.
. Make cmdctl can be configured through bindctl.(after id is added)
