- add policy and policylen to pfkey_send_spddelete() in order to pass   a direction. - add a function, pfkey_send_x4() to send policy management message.
- add policy and policylen to pfkey_send_spddelete() in order to pass
  a direction.
- add a function, pfkey_send_x4() to send policy management message.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame