Remove zfs_ctldir.[ch]

This code is used for snapshot and heavily leverages Solaris
functionality we do not want to reimplement.  These files have
been removed, including references to them, and will be replaced
by a zfs_snap.c/zpl_snap.c implementation which handles snapshots.

module/zfs/Makefile.in

@@ -64,7 +64,6 @@ $(MODULE)-objs += @top_srcdir@/module/zfs/zap_leaf.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zap_micro.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zfs_acl.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zfs_byteswap.o
-$(MODULE)-objs += @top_srcdir@/module/zfs/zfs_ctldir.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zfs_debug.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zfs_dir.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/zfs_fm.o

module/zfs/zfs_dir.c

@@ -51,7 +51,6 @@
 #include <sys/zap.h>
 #include <sys/dmu.h>
 #include <sys/atomic.h>
-#include <sys/zfs_ctldir.h>
 #include <sys/zfs_fuid.h>
 #include <sys/sa.h>
 #include <sys/zfs_sa.h>

module/zfs/zfs_ioctl.c

@@ -58,7 +58,6 @@
 #include <sys/mount.h>
 #include <sys/sdt.h>
 #include <sys/fs/zfs.h>
-#include <sys/zfs_ctldir.h>
 #include <sys/zfs_dir.h>
 #include <sys/zfs_onexit.h>
 #include <sys/zvol.h>

module/zfs/zfs_vfsops.c

@@ -55,7 +55,6 @@
 #include <sys/modctl.h>
 #include <sys/refstr.h>
 #include <sys/zfs_ioctl.h>
-#include <sys/zfs_ctldir.h>
 #include <sys/zfs_fuid.h>
 #include <sys/bootconf.h>
 #include <sys/sunddi.h>

module/zfs/zfs_vnops.c

@@ -68,10 +68,9 @@
 #include <sys/dirent.h>
 #include <sys/policy.h>
 #include <sys/sunddi.h>
-#include <sys/filio.h>
 #include <sys/sid.h>
+#include <sys/mode.h>
 #include "fs/fs_subr.h"
-#include <sys/zfs_ctldir.h>
 #include <sys/zfs_fuid.h>
 #include <sys/zfs_sa.h>
 #include <sys/zfs_vnops.h>