net: add unixgram dial test
Also replaces testing.Errof with testing.Fatalf, make use of ICMP mock. R=golang-dev, dave CC=golang-dev https://golang.org/cl/7308058
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Also replaces testing.Errof with testing.Fatalf, make use of ICMP mock. R=golang-dev, dave CC=golang-dev https://golang.org/cl/7308058