Make Integration cache fixture available in testing package

Phil Dawsonrequested to merge
phil/move-integration-cache-to-testing into master

Description

The cli_integration fixture provided in testing.runcli depends on the integration cache fixture. This was missed when cli_integration was originally exposed.

This must be available in testing in order to make use of cli_integration outside of buildstream because to use a pytest fixture from an external package, pytest requires you import any fixtures on which the fixture you want to use depends.

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