Remove usage of go-ieproxy for windows (#10009)

There is a potential for deadlock on Windows 10
refer https://github.com/mattn/go-ieproxy/issues/17 

remove this dependency for now.

cmd/update.go

@@ -32,7 +32,6 @@ import (
 	"time"
 
 	"github.com/inconshreveable/go-update"
-	"github.com/mattn/go-ieproxy"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/env"
@@ -409,7 +408,7 @@ const updateTimeout = 10 * time.Second
 
 func getUpdateTransport(timeout time.Duration) http.RoundTripper {
 	var updateTransport http.RoundTripper = &http.Transport{
-		Proxy:                 ieproxy.GetProxyFunc(),
+		Proxy:                 http.ProxyFromEnvironment,
 		DialContext:           xhttp.NewCustomDialContext(timeout),
 		IdleConnTimeout:       timeout,
 		TLSHandshakeTimeout:   timeout,

cmd/utils.go

@@ -39,7 +39,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/mattn/go-ieproxy"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/handlers"
@@ -454,7 +453,7 @@ func newCustomHTTPTransport(tlsConfig *tls.Config, dialTimeout time.Duration) fu
 	// For more details about various values used here refer
 	// https://golang.org/pkg/net/http/#Transport documentation
 	tr := &http.Transport{
-		Proxy:                 ieproxy.GetProxyFunc(),
+		Proxy:                 http.ProxyFromEnvironment,
 		DialContext:           xhttp.NewCustomDialContext(dialTimeout),
 		MaxIdleConnsPerHost:   16,
 		MaxIdleConns:          16,

pkg/dsync/drwmutex.go

@@ -185,6 +185,7 @@ func lock(ds *Dsync, locks *[]string, id, source string, isReadLock bool, lockNa
 
 			g := Granted{index: index}
 			if c == nil {
+				log("lock: nil locker")
 				ch <- g
 				return
 			}
@@ -258,7 +259,10 @@ func lock(ds *Dsync, locks *[]string, id, source string, isReadLock bool, lockNa
 				// timeout happened, maybe one of the nodes is slow, count
 				// number of locks to check whether we have quorum or not
 				if !quorumMet(locks, isReadLock, dquorum, dquorumReads) {
+					log("Quorum not met after timeout")
 					releaseAll(ds, locks, isReadLock, restClnts, lockNames...)
+				} else {
+					log("Quorum met after timeout")
 				}
 			}
 

pkg/madmin/transport.go

@@ -21,8 +21,6 @@ import (
 	"net"
 	"net/http"
 	"time"
-
-	"github.com/mattn/go-ieproxy"
 )
 
 // DefaultTransport - this default transport is similar to
@@ -30,7 +28,7 @@ import (
 // is set to true to avoid decompressing content with 'gzip' encoding.
 var DefaultTransport = func(secure bool) http.RoundTripper {
 	tr := &http.Transport{
-		Proxy: ieproxy.GetProxyFunc(),
+		Proxy: http.ProxyFromEnvironment,
 		DialContext: (&net.Dialer{
 			Timeout:   5 * time.Second,
 			KeepAlive: 15 * time.Second,