failed test: test-http-server-multiheaders on smartos

[jbergstroem]

Haven't seen this before. Looks unrelated to branch:

not ok 352 - test-http-server-multiheaders.js
# events.js:85
# throw er; // Unhandled 'error' event
# ^
# Error: connect ECONNREFUSED
# at exports._errnoException (util.js:746:11)
# at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1012:19)

/CC=@nodejs/platform-solaris

[Trott]

#3941 should fix this