build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/karrick/godirwalk/readdir_windows.go

@@ -0,0 +1,66 @@
+// +build windows
+
+package godirwalk
+
+import "os"
+
+// MinimumScratchBufferSize specifies the minimum size of the scratch buffer
+// that ReadDirents, ReadDirnames, Scanner, and Walk will use when reading file
+// entries from the operating system. During program startup it is initialized
+// to the result from calling `os.Getpagesize()` for non Windows environments,
+// and 0 for Windows.
+var MinimumScratchBufferSize = 0
+
+func newScratchBuffer() []byte { return nil }
+
+func readDirents(osDirname string, _ []byte) ([]*Dirent, error) {
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, err
+	}
+
+	fileinfos, err := dh.Readdir(-1)
+	if err != nil {
+		_ = dh.Close()
+		return nil, err
+	}
+
+	entries := make([]*Dirent, len(fileinfos))
+
+	for i, fi := range fileinfos {
+		entries[i] = &Dirent{
+			name:     fi.Name(),
+			path:     osDirname,
+			modeType: fi.Mode() & os.ModeType,
+		}
+	}
+
+	if err = dh.Close(); err != nil {
+		return nil, err
+	}
+	return entries, nil
+}
+
+func readDirnames(osDirname string, _ []byte) ([]string, error) {
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, err
+	}
+
+	fileinfos, err := dh.Readdir(-1)
+	if err != nil {
+		_ = dh.Close()
+		return nil, err
+	}
+
+	entries := make([]string, len(fileinfos))
+
+	for i, fi := range fileinfos {
+		entries[i] = fi.Name()
+	}
+
+	if err = dh.Close(); err != nil {
+		return nil, err
+	}
+	return entries, nil
+}