Title: #626: Move helper code for integration plugin
Changed field: body
Helper code for ```ipatests.pytest_plugins.integration``` was in
```ipatests.test_integration```. This doesn't play nice with pytests
auto-discovery of test cases. Certain aspects of pytest are not available right
away. For example ```pytest.config``` is generated after configuration stage
but before discovery stage.
Now all helper code is next to the plugin in
```ipatests.pytest_plugins.integration``` (which is now a package).
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