/etc/rc.subr: rename sysctl.conf.d to sysctl.kld.d

This better reflects the intent that this directory is indexed by kld
name and removes a conflict with D32128 which aims to split sysctl.conf.

Reviewed by:	kevans imp
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D41043

etc/mtree/BSD.root.dist

@@ -96,7 +96,7 @@
         ..
         ssl
         ..
-	sysctl.conf.d
+	sysctl.kld.d
 	..
         syslog.d
         ..

libexec/rc/rc.subr

@@ -1970,8 +1970,8 @@ load_kld()
 			return 1
 		else
 			info "$1 kernel module loaded."
-			if [ -f "/etc/sysctl.conf.d/$1.conf" ]; then
-				sysctl -f "/etc/sysctl.conf.d/$1.conf"
+			if [ -f "/etc/sysctl.kld.d/$1.conf" ]; then
+				sysctl -f "/etc/sysctl.kld.d/$1.conf"
 			fi
 		fi
 	else

share/man/man5/sysctl.conf.5

@@ -54,10 +54,10 @@ section, below.
 .Pp
 For kernel modules loaded via
 .Xr rc.subr 8
-system ,
+system,
 additional module-specific settings can be applied
 by adding a file in the same format named
-.Pf /etc/sysctl.d/<module name>.conf .
+.Pf /etc/sysctl.kld.d/<module name>.conf .
 .Sh FILES
 .Bl -tag -width /etc/rc.d/sysctl_lastload -compact
 .It Pa /etc/rc.d/sysctl
@@ -76,7 +76,7 @@ Initial settings for
 .It Pa /etc/sysctl.conf.local
 Machine-specific settings for sites with a common
 .Pa /etc/sysctl.conf .
-.It Pa /etc/sysctl.conf.d
+.It Pa /etc/sysctl.kld.d
 Module specific settings for kernel modules loaded via
 .Xr rc.subr 8 .
 .El