openntpd: register 'ntpd' alternatives group.

Also create a log service to log stderr to syslog.

srcpkgs/openntpd/files/openntpd/log/run

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec logger -t openntpd -p daemon.notice

srcpkgs/openntpd/files/openntpd/run

@@ -1,3 +1,3 @@
 #!/bin/sh
 [ -r conf ] && . ./conf
-exec ntpd -d ${OPTS:=-s}
+exec ntpd -d ${OPTS:=-s} 2>&1

srcpkgs/openntpd/template

@@ -1,7 +1,7 @@
 # Template file for 'openntpd'
 pkgname=openntpd
 version=5.7p4
-revision=8
+revision=9
 build_pie=yes
 build_style=gnu-configure
 configure_args="--with-privsep-user=$pkgname --with-cacert=/etc/ssl/certs.pem"
@@ -17,13 +17,22 @@ checksum=a993d95976e375acc0ab1a677fd268f55024477835633c8ae404895046bccb23
 
 conf_files="/etc/ntpd.conf"
 provides="ntp-daemon-0_1"
-replaces="ntp-daemon>=0"
 system_accounts="$pkgname"
+alternatives="
+ ntpd:ntpd:/usr/bin/openntpd
+ ntpd:ntpd.8:/usr/share/man/man1/openntpd.8
+ ntpd:ntpd:/etc/sv/openntpd"
 
 pre_configure() {
 	autoreconf -fi
 }
 post_install() {
+	# Rename files for alternatives.
+	mv ${DESTDIR}/usr/bin/{ntpd,$pkgname}
+	mv ${DESTDIR}/usr/share/man/man8/{ntpd,openntpd}.8
+	# Use a symlink instead.
+	rm ${DESTDIR}/usr/bin/ntpctl
+	ln -s openntpd ${DESTDIR}/usr/bin/ntpctl
 	vsv $pkgname
 	vlicense COPYING
 }