Add support for parity trace_filter calls

[jknap]

What was wrong?

Currently, some parity trace calls are supported, but not trace_filter.

How was it fixed?

I created the appropriate traceFilter method in the parity module and the corresponding test.
Also, the parity integration tests were failing in the docker container because the PARITY_VERSION environment variable was not set - I added that.

Cute Animal Picture

[carver]

Sweet, thanks!