erp5_core: change erp5_session cache type to Distributed Ram Cache

Previously `Ram Cache` was used, causing anonymous clients to never use portal_session properly.
Mainly for public forum captcha purpose.
Now `Distributed Ram Cache` is used to share the session between the zope nodes.
It's required to restart all zope nodes after this BT5 upgrade.

product/ERP5/bootstrap/erp5_core/PathTemplateItem/portal_caches/erp5_session_cache/1.xml → product/ERP5/bootstrap/erp5_core/PathTemplateItem/portal_caches/erp5_session_cache/2.xml

@@ -2,35 +2,21 @@
 <ZopeData>
   <record id="1" aka="AAAAAAAAAAE=">
     <pickle>
-      <global name="Ram Cache" module="erp5.portal_type"/>
+      <global name="Distributed Ram Cache" module="erp5.portal_type"/>
     </pickle>
     <pickle>
       <dictionary>
         <item>
-            <key> <string>_count</string> </key>
+            <key> <string>categories</string> </key>
             <value>
-              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+              <tuple>
+                <string>specialise/portal_memcached/default_memcached_plugin</string>
+              </tuple>
             </value>
         </item>
-        <item>
-            <key> <string>_mt_index</string> </key>
-            <value>
-              <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
-            </value>
-        </item>
-        <item>
-            <key> <string>_tree</string> </key>
-            <value>
-              <persistent> <string encoding="base64">AAAAAAAAAAQ=</string> </persistent>
-            </value>
-        </item>
-        <item>
-            <key> <string>cache_expire_check_interval</string> </key>
-            <value> <int>1800</int> </value>
-        </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>1</string> </value>
+            <value> <string>2</string> </value>
         </item>
         <item>
             <key> <string>int_index</string> </key>
@@ -38,35 +24,13 @@
         </item>
         <item>
             <key> <string>portal_type</string> </key>
-            <value> <string>Ram Cache</string> </value>
+            <value> <string>Distributed Ram Cache</string> </value>
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>RAM Cache</string> </value>
+            <value> <string>Distributed Ram Cache</string> </value>
         </item>
       </dictionary>
     </pickle>
   </record>
-  <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="Length" module="BTrees.Length"/>
-    </pickle>
-    <pickle> <int>0</int> </pickle>
-  </record>
-  <record id="3" aka="AAAAAAAAAAM=">
-    <pickle>
-      <global name="OOBTree" module="BTrees.OOBTree"/>
-    </pickle>
-    <pickle>
-      <none/>
-    </pickle>
-  </record>
-  <record id="4" aka="AAAAAAAAAAQ=">
-    <pickle>
-      <global name="OOBTree" module="BTrees.OOBTree"/>
-    </pickle>
-    <pickle>
-      <none/>
-    </pickle>
-  </record>
 </ZopeData>