Add reminder about passwordless SSH

bsc#1219051
jsc#DOCTEAM-1246

xml/ha_yast_cluster.xml

@@ -996,6 +996,23 @@ Finished with 1 errors.</screen>
 
   <sect1 xml:id="sec-ha-installation-start">
    <title>Bringing the cluster online</title>
+   <para>
+    Before starting the cluster, make sure passwordless SSH is configured between the nodes.
+    If you did not already configure passwordless SSH before setting up the cluster, you can
+    do so now by using the <literal>ssh</literal> stage of the bootstrap scripts:
+   </para>
+   <orderedlist>
+     <listitem>
+       <para>
+         On the first node, run <command>crm cluster init ssh</command>.
+       </para>
+     </listitem>
+     <listitem>
+       <para>
+         On the rest of the nodes, run <command>crm cluster join ssh -c <replaceable>NODE1</replaceable></command>.
+       </para>
+     </listitem>
+   </orderedlist>
    <para>
     After the initial cluster configuration is done, start the cluster
     services on all cluster nodes to bring the stack online:
@@ -1012,11 +1029,6 @@ Finished with 1 errors.</screen>
       Start the cluster services on all cluster nodes:
      </para>
 <screen>&prompt.root;<command>crm cluster start --all</command></screen>
-     <para>
-      This command requires passwordless SSH between the nodes. If passwordless SSH
-      is not configured, you must log in to each node individually and run
-      <command>crm cluster start</command>.
-     </para>
     </step>
     <step>
      <para>