Add unprivileged user for traceroute.

Input deraadt@
OK benno@, sthen@

src/etc/group

@@ -21,6 +21,7 @@ _fingerd:*:33:
 _sshagnt:*:34:
 _x11:*:35:
 utmp:*:45:
+_traceroute:*:50:
 _ping:*:51:
 _rebound:*:52:
 _unbound:*:53:

src/etc/mail/aliases

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: aliases,v 1.58 2016/09/26 17:42:09 otto Exp $
+#	$OpenBSD: aliases,v 1.59 2016/09/27 05:31:37 florian Exp $
 #
 #  Aliases in this file will NOT be expanded in the header from
 #  Mail, but WILL be visible over networks or from /usr/libexec/mail.local.
@@ -65,6 +65,7 @@ _snmpd: /dev/null
 _spamd: /dev/null
 _syslogd: /dev/null
 _tcpdump: /dev/null
+_traceroute: /dev/null
 _tftpd: /dev/null
 _unbound: /dev/null
 _vmd: /dev/null

src/etc/master.passwd

@@ -9,6 +9,7 @@ _rstatd:*:30:30::0:0:rpc.rstatd:/var/empty:/sbin/nologin
 _rusersd:*:32:32::0:0:rpc.rusersd:/var/empty:/sbin/nologin
 _fingerd:*:33:33::0:0:fingerd:/var/empty:/sbin/nologin
 _x11:*:35:35::0:0:X Server:/var/empty:/sbin/nologin
+_traceroute:*:50:50::0:0:traceroute privdrop user:/var/empty:/sbin/nologin
 _ping:*:51:51::0:0:ping privdrop user:/var/empty:/sbin/nologin
 _rebound:*:52:52::0:0:Rebound DNS Daemon:/var/empty:/sbin/nologin
 _unbound:*:53:53:unbound:0:0:Unbound Daemon:/var/unbound:/sbin/nologin