Remove now-obsolete CVS $Id tags from text files.

Since -portable switched to git, the CVS $Id tags are no longer being
updated and are becoming increasingly misleading.  Remove them.

CREDITS

@@ -100,6 +100,3 @@ Zack Weinberg <zack@wolery.cumb.org> - GNOME askpass enhancement
 Apologies to anyone I have missed.
 
 Damien Miller <djm@mindrot.org>
-
-$Id: CREDITS,v 1.81 2006/08/30 17:24:41 djm Exp $
-

INSTALL

@@ -263,6 +263,3 @@ summary data may be published.
 If you experience problems compiling, installing or running OpenSSH.
 Please refer to the "reporting bugs" section of the webpage at
 http://www.openssh.com/
-
-
-$Id: INSTALL,v 1.91 2014/09/09 02:23:11 dtucker Exp $

README

@@ -65,5 +65,3 @@ References -
     (PAM also is standard on Solaris and HP-UX 11)
 [6] http://www.openbsd.org/cgi-bin/man.cgi?query=style&sektion=9
 [7] http://www.openssh.com/faq.html
-
-$Id: README,v 1.87 2014/08/10 01:35:06 djm Exp $

README.platform

@@ -94,6 +94,3 @@ added to sshd's session stack which will prevent users from starting shell
 sessions.  Alternatively, pam_nologin can be added to either the auth or
 account stacks which will prevent authentication entirely, but will still
 return the output from pam_nologin to the client.
-
-
-$Id: README.platform,v 1.10 2009/08/28 23:14:48 dtucker Exp $

README.privsep

@@ -59,5 +59,3 @@ Given the following process listing (from HP-UX):
 process 1005 is the sshd process listening for new connections.
 process 6917 is the privileged monitor process, 6919 is the user owned
 sshd process and 6921 is the shell process.
-
-$Id: README.privsep,v 1.16 2005/06/04 23:21:41 djm Exp $

TODO

@@ -82,5 +82,3 @@ PrivSep Issues:
   + SIA is broken
 - Cygwin
   + Privsep for Pre-auth only (no fd passing)
-
-$Id: TODO,v 1.58 2004/12/06 11:40:11 dtucker Exp $