Bug: Close hvsock handle on listen error; fix tests (#310)

* Bug: Close hvsock handle on listen error; fix tests

Close the socket created in
`github.com/Microsoft/go-winio/pkg/ListenHvsock` if either the `Bind` or
`Listen` calls fail.

Go changed `filepath.VolumeName` code, resulting in different behavior in
`github.com/Microsoft/go-winio/pkg/fs.GetFileSystemType`.
Update test accordingly.
Also add more debug logs to `pkg\fs\resolve_test.go`.

Also, move add skip for fuzzing on WS2019 or older to `FuzzHvSockRxTx`
code directly, instead of in ci.yml.

See: https://go-review.googlesource.com/c/go/+/540277

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

* PR: unskip TestResolvePath

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

---------

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

hvsock_go118_test.go

@@ -7,9 +7,16 @@ import (
 	"fmt"
 	"testing"
 	"time"
+
+	"golang.org/x/sys/windows"
 )
 
 func FuzzHvSockRxTx(f *testing.F) {
+	//  fuzzing fails on windows 2019 for some reason, even though tests pass
+	if _, _, build := windows.RtlGetNtVersionNumbers(); build <= 17763 {
+		f.Skipf("build (%d) must be > %d", build, 17763)
+	}
+
 	for _, b := range [][]byte{
 		[]byte("hello?"),
 		[]byte("This is a really long string that should be a good example of the really long " +