Fixed a copyright header.
Fixed a copyright header.

Change-Id: I8ad8de2c70ca6aaa568a235a3ead0510c8baeb13
Signed-off-by: Hideyuki Tai <87b3ecc686f9d387127fb9c6b83e75a0e66a7ae8@necam.com>

opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn