Move Mount into mount pkg

This moves both the Mount type and mountinfo into a single mount
package.

This also opens up the root of the repo to hold the containerd client
implementation.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

mount/mount.go

@@ -0,0 +1,24 @@
+package mount
+
+// Mount is the lingua franca of containerd. A mount represents a
+// serialized mount syscall. Components either emit or consume mounts.
+type Mount struct {
+	// Type specifies the host-specific of the mount.
+	Type string
+	// Source specifies where to mount from. Depending on the host system, this
+	// can be a source path or device.
+	Source string
+	// Options contains zero or more fstab-style mount options. Typically,
+	// these are platform specific.
+	Options []string
+}
+
+// MountAll mounts all the provided mounts to the provided target
+func MountAll(mounts []Mount, target string) error {
+	for _, m := range mounts {
+		if err := m.Mount(target); err != nil {
+			return err
+		}
+	}
+	return nil
+}