Add more op monitors to the NFS guide (#430)

Based on PR#429
See also bsc#1231386

xml/article_nfs_storage.xml

@@ -554,15 +554,17 @@ include /etc/drbd.d;</screen>
       Create a primitive for the NFS client states on <literal>/dev/drbd0</literal>:
      </para>
 <screen>&prompt.crm.conf;<command>primitive fs-nfs-state Filesystem \
-  params device=/dev/drbd0 directory=/var/lib/nfs fstype=ext4</command></screen>
+  params device=/dev/drbd0 directory=/var/lib/nfs fstype=ext4 \
+  op monitor timeout=40s interval=20s</command></screen>
     </step>
     <step>
      <para>
       Create a primitive for the file system to be exported on
       <literal>/dev/drbd1</literal>:
      </para>
 <screen>&prompt.crm.conf;<command>primitive fs-nfs-share Filesystem \
-  params device=/dev/drbd1 directory=/srv/nfs/share fstype=ext4</command></screen>
+  params device=/dev/drbd1 directory=/srv/nfs/share fstype=ext4 \
+  op monitor timeout=40s interval=20s</command></screen>
      <para>
       <emphasis>Do not</emphasis> commit this configuration until
     after you add the colocation and order constraints.
@@ -732,7 +734,10 @@ include /etc/drbd.d;</screen>
      <para>
       Create a primitive for the virtual IP address:
      </para>
-<screen>&prompt.crm.conf;<command>primitive vip-nfs IPaddr2 params ip=&nfs-vip-exports;</command></screen>
+<screen>&prompt.crm.conf;<command>primitive vip-nfs IPaddr2 \
+  params ip=&nfs-vip-exports; \
+  op monitor timeout=20s interval=10s
+</command></screen>
     </step>
     <step>
      <para>
@@ -887,7 +892,8 @@ include /etc/drbd.d;</screen>
     Create a primitive for the file system to be exported on <literal>/dev/drbd2</literal>:
    </para>
 <screen>&prompt.crm.conf;<command>primitive fs-nfs-share2 Filesystem \
-  params device="/dev/drbd2" directory="/srv/nfs/share2" fstype=ext4</command></screen>
+  params device="/dev/drbd2" directory="/srv/nfs/share2" fstype=ext4 \
+  op monitor timeout=40s interval=20s</command></screen>
   </step>
   <step>
    <para>