Ensure grpc channels are in separate process

Raoul Hidalgo Charmanrequested to merge
raoul/1023-grpc-forking into master

Description

In artifactservice.py tests, I didn't run the channel in a separate process which causes issues (see here). This may have been what was causing the tests to later hang related to FTP/HTTP server tests as these these fork.

This merge request is related to #1023 (closed), but may not 100% fix it.

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