net: TestDialTimeoutFDLeak failure
net: TestDialTimeoutFDLeak failure

Fixes issue 4384.

Implments the suggestion by rsc in comment 15, http://code.google.com/p/go/issues/detail?id=4384#c15

An alternate suggestion would be to temporarily set GOMAXPROCS to 1 during this test.

R=fullung, rsc
CC=golang-dev
https://codereview.appspot.com/6923046
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go