Update to selinux 1.5.1

Changes are listed here:
https://github.com/opencontainers/selinux/compare/v1.3.3...v1.5.1

Not urgent as such, just keep up with eco-system.

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go

@@ -1,4 +1,4 @@
-// +build !selinux
+// +build !selinux !linux
 
 package selinux
 
@@ -35,6 +35,11 @@ func GetEnabled() bool {
 	return false
 }
 
+// ClassIndex returns the int index for an object class in the loaded policy, or -1 and an error
+func ClassIndex(class string) (int, error) {
+	return -1, nil
+}
+
 // SetFileLabel sets the SELinux label for this path or returns an error.
 func SetFileLabel(fpath string, label string) error {
 	return nil
@@ -88,6 +93,13 @@ func CanonicalizeContext(val string) (string, error) {
 	return "", nil
 }
 
+/*
+ComputeCreateContext requests the type transition from source to target for class  from the kernel.
+*/
+func ComputeCreateContext(source string, target string, class string) (string, error) {
+	return "", nil
+}
+
 /*
 SetExecLabel sets the SELinux label that the kernel will use for any programs
 that are executed by the current process thread, or an error.
@@ -101,7 +113,7 @@ SetTaskLabel sets the SELinux label for the current thread, or an error.
 This requires the dyntransition permission.
 */
 func SetTaskLabel(label string) error {
-        return nil
+	return nil
 }
 
 /*
@@ -189,6 +201,18 @@ func ROFileLabel() string {
 	return ""
 }
 
+// KVMContainerLabels returns the default processLabel and mountLabel to be used
+// for kvm containers by the calling process.
+func KVMContainerLabels() (string, string) {
+	return "", ""
+}
+
+// InitContainerLabels returns the default processLabel and file labels to be
+// used for containers running an init system like systemd by the calling
+func InitContainerLabels() (string, string) {
+	return "", ""
+}
+
 /*
 ContainerLabels returns an allocated processLabel and fileLabel to be used for
 container labeling by the calling process.