test: http2 priority stream depends on itself

This commit add test case where priority() throws ERR_INVALID_OPT_VALUE
when stream depends on itself

Refs: https://github.com/nodejs/node/issues/14985
PR-URL: https://github.com/nodejs/node/pull/16224


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>