MAP-73 Update EC Bite Device Server

This story started out as a follow-up story of MAP-40 from PI21 to finish up some remaining work for the BITE device server. It later became a story to simplify how the BITE DS works, as follows:

1. Remove all unnecessary attributes (and their methods and references to them) including:

• targetTalons
• test_id
• input_data_id
• config_method
• bite_config_id
• bite_initial_timestamp_time_offset
• test_parameters
• bite_json
• test_param_location
• talon_instance
• bite_mac_address

2. Add the following attributes (and their methods):

• bite_config_data
• filter_data
• cbf_input_data

3. Add commands that take in a file as a string and load in those 3 new attributes
4. Remove any reference to tests.json file
5. Remove obsolete json files
6. Remove load_in_input_json() and simplify init()
7. Rename bite.py to bite_device.py
8. Add error handling if invalid jsons are loaded
9. All commands now return a tuple that consists of: [ [ResultCode], [message] ]
10. Changed num_taps to num_coeffs in bite_client.py, as num_taps doesn't exist in the filters.