Allow CMIS test feature to be used from third-party bundle

Currently, when a module outside nuxeo-chemistry attempts to use test feature CmisFeatureSessionHttp, its Tomcat docBase references a read-only path in the nuxeo-opencmis-tests jar file. Instead, Tomcat docBase should reference a valid path within the target directory of the test just like it does for tests in module nuxeo-opencmis-tests.

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It's now possible to have third-party modules use the CmisFeatureSessionHttp feature to run their own tests in the context of a preconfigured test CMIS server.