test: add known issue test for #7788

15157c3c changed the CLI REPL
to default to useGlobal: false by default. This caused the
regression seen in https://github.com/nodejs/node/issues/7788.
This commit adds a known issue test while a proper resolution
is determined.

Refs: https://github.com/nodejs/node/pull/5703
Refs: https://github.com/nodejs/node/issues/7788
PR-URL: https://github.com/nodejs/node/pull/7793


Reviewed-By: Rich Trott <rtrott@gmail.com>