test: use common.PIPE for emptyTxt path
test: use common.PIPE for emptyTxt path

Work-around for long paths exceeding limits for UNIX socket binds,
emptyTxt would otherwise be burried deep in the fixtures directory.

PR-URL: https://github.com/node-forward/node/pull/51
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node