Add helper function to read out CRIU version

This adds a simple CRIU version check using the vendored-in
CRIU go bindings.

Signed-off-by: Adrian Reber <areber@redhat.com>

pkg/criu/criu.go

@@ -0,0 +1,19 @@
+package criu
+
+import (
+	"github.com/checkpoint-restore/go-criu"
+)
+
+// MinCriuVersion for Podman at least CRIU 3.11 is required
+const MinCriuVersion = 31100
+
+// CheckForCriu uses CRIU's go bindings to check if the CRIU
+// binary exists and if it at least the version Podman needs.
+func CheckForCriu() bool {
+	c := criu.MakeCriu()
+	result, err := c.IsCriuAtLeast(MinCriuVersion)
+	if err != nil {
+		return false
+	}
+	return result
+}