Change Docker-commands

* Where possible replace grep and awk based commands
  to find container IDs with Docker-native solution.

xml/admin_administration.xml

@@ -138,7 +138,7 @@ caasp3-worker-4   Ready     &lt;none&gt;    1d        v1.9.8</screen>
   <para>
    Log in to the admin node and run:
   </para>
-<screen>&prompt.user;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+<screen>&prompt.user;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt -P 'roles:(admin|kube-master|kube-minion)' \
 cmd.run "<replaceable>df -h</replaceable>"</command>
 </screen>
@@ -521,14 +521,14 @@ entrypoint.sh bundle exec rails runner 'puts Minion.find_by(minion_id: "<replace
       <para>
        Gracefully shut down all worker nodes.
       </para>
-<screen>&prompt.root.admin;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+<screen>&prompt.root.admin;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt --async -G 'roles:kube-minion' cmd.run 'systemctl poweroff'</command></screen>
      </step>
      <step>
       <para>
        Gracefully shut down all master nodes.
       </para>
-<screen>&prompt.root.admin;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+<screen>&prompt.root.admin;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt --async -G 'roles:kube-master' cmd.run 'systemctl poweroff'</command></screen>
      </step>
      <step>

xml/admin_logging.xml

@@ -254,7 +254,7 @@
    <para>
     Retrieve the <literal>salt-master</literal> logs.
    </para>
-<screen>&prompt.user;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+<screen>&prompt.user;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 cat /var/log/salt/master</command>
     </screen>
   </sect2>
@@ -271,7 +271,7 @@ cat /var/log/salt/master</command>
     by reading the <filename>/var/log/salt/minion</filename> file.
    </para>
 <screen>
-&prompt.user;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+&prompt.user;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt '*' cmd.run "cat /var/log/salt/minion"</command>
     </screen>
   </sect2>
@@ -381,7 +381,7 @@ salt '*' cmd.run "cat /var/log/salt/minion"</command>
      <literal>salt-master</literal> container, like:
     </para>
 <screen>
-<command>docker rm -f $(docker ps | grep salt-master | awk '{print $1}')</command>.
+<command>docker rm -f $(docker ps -q -f name=salt-master)</command>.
      </screen>
     <para>
      After deleting this container, the <literal>kubelet</literal> will bring
@@ -390,7 +390,7 @@ salt '*' cmd.run "cat /var/log/salt/minion"</command>
      <literal>debug</literal> loglevel.
     </para>
 <screen>
-<command>docker logs -f $(docker ps | grep salt-master | awk '{print $1}')</command>
+<command>docker logs -f $(docker ps -q -f name=salt-master)</command>
    </screen>
    </sect3>
   </sect2>
@@ -424,7 +424,7 @@ salt '*' cmd.run "cat /var/log/salt/minion"</command>
   </para>
 
 <screen>
-&prompt.user;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+&prompt.user;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt -P 'roles:(admin|kube-master|kube-minion)' \
 cmd.run "journalctl -u transactional-update"</command>
  </screen>
@@ -617,7 +617,7 @@ entrypoint.sh bundle exec rake "velum:create_pillar['kube_log_level', '5']"</com
        Then run Salt orchestration to rebuild the configuration across the
        cluster.
       </para>
-<screen>&prompt.user;<command>docker exec -it $(docker ps | grep salt-master | awk '{print $1}') \
+<screen>&prompt.user;<command>docker exec -it $(docker ps -q -f name=salt-master) \
 salt-run state.orchestrate orch.kubernetes</command>
    </screen>
      </step>

xml/admin_software.xml

@@ -389,7 +389,7 @@
    </para>
 
    <screen>
-&prompt.user;<command>docker exec -i  $(docker ps | grep salt-master | awk '{print $1}') \
+&prompt.user;<command>docker exec -i  $(docker ps -q -f name=salt-master) \
 salt --batch 10 -P "roles:(admin|kube-(master|minion))" \
 cmd.run "rpm -q SUSEConnect"</command>
 
@@ -438,7 +438,7 @@ retcode:
     <literal>transactional-update.timer</literal>.
     </para>
     <screen>
-&prompt.user;<command>docker exec -i $(docker ps | grep salt-master | awk '{print $1}') \
+&prompt.user;<command>docker exec -i $(docker ps -q -f name=salt-master) \
 salt --batch 10 -P "roles:(admin|kube-(master|minion))" \
 cmd.run "systemctl disable --now transactional-update.timer"</command>
 
@@ -500,7 +500,7 @@ retcode:
      </para>
     </note>
     <screen>
-&prompt.user;<command>docker exec -i $(docker ps | grep salt-master | awk '{print $1}') \
+&prompt.user;<command>docker exec -i $(docker ps -q -f name=salt-master) \
 salt --batch <replaceable>10</replaceable> -P "roles:(admin|kube-(master|minion))" \
 cmd.run "transactional-update salt migration -n" \
 | tee transactional-update-migration.log</command>