Update plugin-writers-guide to include test guidelines/limitations
We recently had a test fail under Travis, because the test was directly importing a model from pulpcore. That model relies on createrepo_c import. Under Travis, the client was running ubuntu, createrepo_c didn't exist, and the import failed.
It would be great if the plugin-writers-guide explicitly described what imports are 'legal' to use in the functional tests.
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