net: skip TestProtocolDialError on solaris

Unfortunately there's no simple, easy way to make Dial{TCP,UDP} fail
consistently across all platforms. Fow now we skip the test on Solaris.

Change-Id: Ib3c55f670ac6a174fe9ea682dac7aab96b1e9dfb
Reviewed-on: https://go-review.googlesource.com/11058Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/error_test.go

@@ -161,7 +161,7 @@ func TestDialError(t *testing.T) {
 
 func TestProtocolDialError(t *testing.T) {
 	switch runtime.GOOS {
-	case "nacl":
+	case "nacl", "solaris":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}