Revision 331527

MFC r330781:
  Update pfkey_open() function to set socket's write buffer size to
  128k and receive buffer size to 2MB. In case if system has bigger
  default values, do not lower them.

  This should partially solve the problem, when setkey(8) returns
  EAGAIN error on systems with many SAs or SPs.

  PR:		88336
  Obtained from:	NetBSD/ipsec-tools