merge in vnodes

merge in vnodes

SCCS-vsn: sys/kern/kern_acct.c 7.5
SCCS-vsn: sys/kern/kern_descrip.c 7.4
SCCS-vsn: sys/kern/kern_exec.c 7.10
SCCS-vsn: sys/kern/kern_exit.c 7.7
SCCS-vsn: sys/kern/kern_fork.c 7.6
SCCS-vsn: sys/kern/kern_ktrace.c 1.4
SCCS-vsn: sys/kern/kern_proc.c 7.6
SCCS-vsn: sys/kern/kern_sig.c 7.8
SCCS-vsn: sys/kern/kern_subr.c 7.2
SCCS-vsn: sys/kern/subr_log.c 7.3
SCCS-vsn: sys/kern/sys_generic.c 7.10
SCCS-vsn: sys/kern/sys_process.c 7.6
SCCS-vsn: sys/kern/sys_socket.c 7.5
SCCS-vsn: sys/kern/tty.c 7.17
SCCS-vsn: sys/kern/tty_bk.c 7.3
SCCS-vsn: sys/kern/tty_pty.c 7.6
SCCS-vsn: sys/kern/tty_tb.c 7.5
SCCS-vsn: sys/kern/uipc_socket.c 7.14
SCCS-vsn: sys/kern/uipc_syscalls.c 7.10
SCCS-vsn: sys/kern/uipc_usrreq.c 7.11
SCCS-vsn: sys/vm/vm_meter.c 7.5
SCCS-vsn: sys/vm/vm_swap.c 7.5
SCCS-vsn: sys/kern/kern_physio.c 7.6