For the sake of consistency and easier typing,

introduce "-tunnel" as an alias for "deletetunnel".
The latter is overly long and prone to typos,  but
keep it for POLA since it costs nothing.

MFC after:	5 days

sbin/ifconfig/ifconfig.8

@@ -1153,10 +1153,14 @@ and
 .Ar dest_addr
 are interpreted as the outer source/destination for the encapsulating
 IPv4/IPv6 header.
-.It Cm deletetunnel
+.It Fl tunnel
 Unconfigure the physical source and destination address for IP tunnel
 interfaces previously configured with
 .Cm tunnel .
+.It Cm deletetunnel
+Another name for the
+.Fl tunnel
+parameter.
 .El
 .Pp
 The following parameters are specific to

sbin/ifconfig/ifconfig.c

@@ -1026,6 +1026,7 @@ static struct cmd basic_cmds[] = {
 	DEF_CMD_ARG("broadcast",		setifbroadaddr),
 	DEF_CMD_ARG("ipdst",			setifipdst),
 	DEF_CMD_ARG2("tunnel",			settunnel),
+	DEF_CMD("-tunnel", 0,			deletetunnel),
 	DEF_CMD("deletetunnel", 0,		deletetunnel),
 	DEF_CMD("link0",	IFF_LINK0,	setifflags),
 	DEF_CMD("-link0",	-IFF_LINK0,	setifflags),