Update links.

Make links to openssh.com HTTPS now that it's supported, point release
notes link to the HTML release notes page, and update a couple of other
links and bits of text.

README

@@ -1,10 +1,10 @@
-See http://www.openssh.com/txt/release-7.3p1 for the release notes.
+See https://www.openssh.com/releasenotes.html#7.3p1 for the release notes.
 
-Please read http://www.openssh.com/report.html for bug reporting
+Please read https://www.openssh.com/report.html for bug reporting
 instructions and note that we do not use Github for bug reporting or
 patch/pull-request management.
 
-- A Japanese translation of this document and of the OpenSSH FAQ is
+- A Japanese translation of this document and of the release notes is
 - available at http://www.unixuser.org/~haruyama/security/openssh/index.html
 - Thanks to HARUYAMA Seigo <[email protected]>
 
@@ -16,7 +16,7 @@ implementation with all patent-encumbered algorithms removed (to
 external libraries), all known security bugs fixed, new features
 reintroduced and many other clean-ups.  OpenSSH has been created by
 Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt,
-and Dug Song. It has a homepage at http://www.openssh.com/
+and Dug Song. It has a homepage at https://www.openssh.com/
 
 This port consists of the re-introduction of autoconf support, PAM
 support, EGD[1]/PRNGD[2] support and replacements for OpenBSD library
@@ -33,17 +33,15 @@ all logins, not just when using password authentication.
 OpenSSH depends on Zlib[3], OpenSSL[4] and optionally PAM[5].
 
 There is now several mailing lists for this port of OpenSSH. Please
-refer to http://www.openssh.com/list.html for details on how to join.
+refer to https://www.openssh.com/list.html for details on how to join.
 
 Please send bug reports and patches to the mailing list
 [email protected]. The list is open to posting by
 unsubscribed users.Code contribution are welcomed, but please follow the 
 OpenBSD style guidelines[6].
 
 Please refer to the INSTALL document for information on how to install
-OpenSSH on your system. There are a number of differences between this
-port of OpenSSH and F-Secure SSH 1.x, please refer to the OpenSSH FAQ[7]
-for details and general tips.
+OpenSSH on your system.
 
 Damien Miller <[email protected]>
 
@@ -55,13 +53,12 @@ implementation released by Tatu Ylonen.
 
 References -
 
-[0] http://www.openssh.com/faq.html
+[0] https://www.openssh.com/
 [1] http://www.lothar.com/tech/crypto/
 [2] http://www.aet.tu-cottbus.de/personen/jaenicke/postfix_tls/prngd.html
 [3] http://www.gzip.org/zlib/
 [4] http://www.openssl.org/
 [5] http://www.openpam.org
-    http://www.kernel.org/pub/linux/libs/pam/ 
+    http://www.kernel.org/pub/linux/libs/pam/
     (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
+[6] http://man.openbsd.org/style.9