packet lib: add Packet.__contains__

you can do something like:
  if arp.arp in Packet(msg.data):

  a = arp.arp(...)
  if a in Packet(msg.data):

  >>> from ryu.lib.packet import packet
  >>> from ryu.lib.packet import arp
  >>> a = arp.arp_ip(1, 0, 0, 0, 0)
  >>> p = packet.Packet()
  >>> p.protocols = [a]
  >>> arp.arp in p
  True
  >>> a in p
  True

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

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