Reverting links that do not support https

xml/apache2.xml

@@ -131,7 +131,7 @@
     </para>
     <step>
      <para>
-      Start a browser and open <link xlink:href="https://localhost/"/>.
+      Start a browser and open <link xlink:href="http://localhost/"/>.
      </para>
      <para>
       If Apache is up and running, you get a test page stating <quote>It
@@ -2495,7 +2495,7 @@ An optional company name []:<co xml:id="co-ssl-self-optional"/></screen>
    It is not installed by default&mdash;the quickest way to install it is to
    use the command <command>zypper in apache2-doc</command>. Having been
    installed, the Apache manual is available at
-   <link xlink:href="https://localhost/manual/"/>. You may also access it on the
+   <link xlink:href="http://localhost/manual/"/>. You may also access it on the
    Web at <link xlink:href="https://httpd.apache.org/docs-2.4/"/>. SUSE-specific
    configuration hints are available in the directory
    <filename>/usr/share/doc/packages/apache2/README.*</filename>.

xml/art_raspberry-pi.xml

@@ -445,7 +445,7 @@
     <listitem>
      <para>
       Easy 7-Zip from
-      <link xlink:href="https://www.e7z.org/"/>
+      <link xlink:href="http://www.e7z.org/"/>
      </para>
     </listitem>
     <listitem>

xml/net_basic.xml

@@ -967,15 +967,15 @@ fe80 :                           : 10 : 1000 : 1a4</screen>
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><link xlink:href="https://www.ipv6day.org"/></term>
+     <term><link xlink:href="http://www.ipv6day.org"/></term>
      <listitem>
       <para>
        All information needed to start your own IPv6 network.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><link xlink:href="https://www.ipv6-to-standard.org/"/></term>
+     <term><link xlink:href="http://www.ipv6-to-standard.org/"/></term>
      <listitem>
       <para>
        The list of IPv6-enabled products.
@@ -1104,7 +1104,7 @@ fe80 :                           : 10 : 1000 : 1a4</screen>
    </para>
    <para>
     For more information on multicast DNS, see
-    <link xlink:href="https://www.multicastdns.org"/>.
+    <link xlink:href="http://www.multicastdns.org"/>.
    </para>
   </note>
  </sect1>

xml/net_proxy.xml

@@ -1002,7 +1002,7 @@ Connection: close
    </para>
    <para>
     For more information on types of ACL rules, see the Squid documentation at
-    <link xlink:href="https://www.squid-cache.org/Versions/v3/3.5/cfgman/acl.html"/>.
+    <link xlink:href="http://www.squid-cache.org/Versions/v3/3.5/cfgman/acl.html"/>.
    </para>
    <example xml:id="ex-squid-school">
     <title>Defining ACL rules</title>
@@ -1465,14 +1465,14 @@ cachemgr_passwd disable all
 
   <para>
    Visit the home page of Squid at
-   <link xlink:href="https://www.squid-cache.org/"/>. Here, find the
+   <link xlink:href="http://www.squid-cache.org/"/>. Here, find the
    <quote>Squid User Guide</quote> and a very extensive collection of FAQs on
    Squid.
   </para>
 
   <para>
    In addition, mailing lists are available for Squid at
-   <link xlink:href="https://www.squid-cache.org/Support/mailing-lists.html"/>.
+   <link xlink:href="http://www.squid-cache.org/Support/mailing-lists.html"/>.
   </para>
  </sect1>
 </chapter>

xml/net_slp.xml

@@ -254,7 +254,7 @@ description=SANE scanner daemon</screen>
     </listitem>
    </varlistentry>
    <varlistentry>
-    <term><link xlink:href="https://www.openslp.org"/>
+    <term><link xlink:href="http://www.openslp.org"/>
     </term>
     <listitem>
      <para>

xml/security_ssh.xml

@@ -779,7 +779,7 @@ Accept updated hostkeys? (yes/no):yes</screen>
     </listitem>
     <listitem>
      <para>
-      <link xlink:href="https://blog.djm.net.au/2015/02/key-rotation-in-openssh-68.html"/>
+      <link xlink:href="http://blog.djm.net.au/2015/02/key-rotation-in-openssh-68.html"/>
      </para>
     </listitem>
     <listitem>

xml/snapper.xml

@@ -2846,7 +2846,7 @@ ID	gen	top level	path
     </question>
     <answer>
      <para>
-      See the Snapper home page at <link xlink:href="https://snapper.io/"/>.
+      See the Snapper home page at <link xlink:href="http://snapper.io/"/>.
      </para>
     </answer>
    </qandaentry>

xml/storage_filesystems.xml

@@ -204,7 +204,7 @@
     managed with the &suse; Snapper infrastructure as explained in
     <xref linkend="cha-snapper"/>. For general information about the &suse;
     Snapper project, see the Snapper Portal wiki at OpenSUSE.org
-    (<link xlink:href="https://snapper.io"/>).
+    (<link xlink:href="http://snapper.io"/>).
    </para>
    <para>
     When using a snapshot to roll back the system, it must be ensured that data

xml/tuning_utilities_dstat.xml

@@ -104,6 +104,6 @@ usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
  <para>
   For more information, see the man page of <command>dstat</command> and
   its Web page at <link
-  xlink:href="https://dag.wieers.com/home-made/dstat/"/>.
+  xlink:href="http://dag.wieers.com/home-made/dstat/"/>.
  </para>
 </sect2>

xml/utilities.xml

@@ -3011,7 +3011,7 @@ sys     0m0.205s<co xml:id="co-util-time-sys"/></screen>
      protocol can query network devices for relevant values of their
      internal counters. Exactly these values are to be stored with RRDtool.
      For more information on SNMP, see
-     <link xlink:href="https://www.net-snmp.org/"/>.
+     <link xlink:href="http://www.net-snmp.org/"/>.
     </para>
     <para>
      Our situation is different&mdash;we need to obtain the data