test: Pass proxy and cert env variable to tox environment

Benjamin Schubertrequested to merge
bschubert/tests-behind-proxy into master

Description

When running behind a proxy, integration tests will fail to fetch the needed resources, as tox does not let the environment pass through the test runner.

Changes proposed in this merge request:

  • allow passing http{,s}_proxy and no_proxy to tox env
  • also pass CA_CERT_FILE to allow specifying certificates for https validation

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