Use actual file interfaces

[nrsyed]

Currently, the protocol (defined in ond.py) uses a DummyInterface to provide test data to the protocol (instead of the local interface or PAR interface). This is purely for testing/debugging purposes, and paths to test files must be manually set in the dummy interface. The protocol and/or SMQTK and/or the calling framework (tinker engine, hydra, etc.) should enable the use of actual file interfaces that can read test metadata from the appropriate files and locations.