unittests: Fixes unit tests for Windows (part 3)

Currently, there are some unit tests that are failing on Windows due to
various reasons:

- paths not properly joined (filepath.Join should be used).
- Proxy Mode IPVS not supported on Windows.
- DeadlineExceeded can occur when trying to read data from an UDP
  socket. This can be used to detect whether the port was closed or not.
- In Windows, with long file name support enabled, file names can have
  up to 32,767 characters. In this case, the error
  windows.ERROR_FILENAME_EXCED_RANGE will be encountered instead.
- files not closed, which means that they cannot be removed / renamed.
- time.Now() is not as precise on Windows, which means that 2
  consecutive calls may return the same timestamp.
- path.Base() will return the same path. filepath.Base() should be used
  instead.
- path.Join() will always join the paths with a / instead of the OS
  specific separator. filepath.Join() should be used instead.

pkg/util/removeall/removeall_test.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -33,7 +34,7 @@ type fakeMounter struct {
 
 // IsLikelyNotMountPoint overrides mount.FakeMounter.IsLikelyNotMountPoint for our use.
 func (f *fakeMounter) IsLikelyNotMountPoint(file string) (bool, error) {
-	name := path.Base(file)
+	name := filepath.Base(file)
 	if strings.HasPrefix(name, "mount") {
 		return false, nil
 	}