Vendor in files for runc/libcontainer

vndr was previously removing .go files in runc/libcontainer since they weren't used anywhere
in cri-o, but kpod stats will use them

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/keys/keyctl.go

@@ -0,0 +1,50 @@
+// +build linux
+
+package keys
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+type KeySerial uint32
+
+func JoinSessionKeyring(name string) (KeySerial, error) {
+	sessKeyId, err := unix.KeyctlJoinSessionKeyring(name)
+	if err != nil {
+		return 0, fmt.Errorf("could not create session key: %v", err)
+	}
+	return KeySerial(sessKeyId), nil
+}
+
+// ModKeyringPerm modifies permissions on a keyring by reading the current permissions,
+// anding the bits with the given mask (clearing permissions) and setting
+// additional permission bits
+func ModKeyringPerm(ringId KeySerial, mask, setbits uint32) error {
+	dest, err := unix.KeyctlString(unix.KEYCTL_DESCRIBE, int(ringId))
+	if err != nil {
+		return err
+	}
+
+	res := strings.Split(string(dest), ";")
+	if len(res) < 5 {
+		return fmt.Errorf("Destination buffer for key description is too small")
+	}
+
+	// parse permissions
+	perm64, err := strconv.ParseUint(res[3], 16, 32)
+	if err != nil {
+		return err
+	}
+
+	perm := (uint32(perm64) & mask) | setbits
+
+	if err := unix.KeyctlSetperm(int(ringId), perm); err != nil {
+		return err
+	}
+
+	return nil
+}