Give mock factory-created modules a factory prop
Give mock factory-created modules a factory prop

Otherwise they cannot create their own submodules. This only applies to
the mock factory because the real factory does this correctly.

[endlessm/eos-sdk#4000]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib