listen(8): remove old cpu, exportfs and rexec listeners

rc/bin/service/!il17007

@@ -1,4 +0,0 @@
-#!/bin/rc
-
-netdir=`{echo $3 | sed 's;/[0-9]+$;!*!0;'}
-exec exportfs -a -A $netdir

rc/bin/service/!il17008

@@ -1,2 +0,0 @@
-#!/bin/rc
-exec /bin/exportfs -s

rc/bin/service/!tcp17007

@@ -1,3 +0,0 @@
-#!/bin/rc
-netdir=`{echo $3 | sed 's;/[0-9]+$;!*!0;'}
-exec /bin/oexportfs -a -A $netdir

rc/bin/service/!tcp17009

@@ -1,2 +0,0 @@
-#!/bin/rc
-exec /bin/ip/rexexec >[2=1]

rc/bin/service/!tcp17010

@@ -1,3 +0,0 @@
-#!/bin/rc
-netdir=`{echo $3 | sed 's;/[0-9]+$;!*!0;'}
-exec /bin/cpu -A $netdir -R

sys/man/8/listen

@@ -112,46 +112,14 @@ and multiplex multiple users on a single connection
 .IR srv (4),
 and also by Unix systems to see Plan 9 files).
 .TP
-.B tcp17007
-serve a piece of the name space using the Plan 9 file system protocol,
-with authentication at the start,
-optional SSL encryption,
-and no multiplexing of users
-(typically used by
-.IR cpu (1)
-and
-.IR import (4)).
-Not usable by user
-.IR none .
-.TP
-.B tcp17008
-like
-.BR tcp17007 ,
-but serves the root of the tree,
-forgoing the negotiation for which subtree to serve.
-.TP
-.B tcp17009
-.I rx
-remote execution.
-.TP
-.B tcp17010
-server for
-.IR cpu (1)
-command.
-.TP
-.B tcp17013
-server for old
-.IR cpu (1)
-command for compatibility with old clients.
-.TP
 .B tcp17019
 server for
 .IR rcpu (1),
 replaces
 .IR rx ,
-.IR import (4)
+.IR import
 and
-.IR cpu (1)
+.IR cpu
 using TLS for encryption. 
 .TP
 .B tcp17020