slapos_cloud: Group on assignment for accountant

   Include a constraint to ensure group is set when function/accounting/{agent,manager} is used on
   assignments.

master/bt5/slapos_cloud/PropertySheetTemplateItem/portal_property_sheets/SlaposAssignmentConstraint/group_for_accountant_constraint.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="Category Membership Arity Constraint" module="erp5.portal_type"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_identity_criterion</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+            </value>
+        </item>
+        <item>
+            <key> <string>_range_criterion</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+            </value>
+        </item>
+        <item>
+            <key> <string>constraint_base_category</string> </key>
+            <value>
+              <tuple>
+                <string>group</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>constraint_portal_type</string> </key>
+            <value> <string>python: (\'Category\',)</string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>group_for_accountant_constraint</string> </value>
+        </item>
+        <item>
+            <key> <string>int_index</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>max_arity</string> </key>
+            <value> <int>1</int> </value>
+        </item>
+        <item>
+            <key> <string>membership_criterion_category</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+        <item>
+            <key> <string>message_arity_not_in_range</string> </key>
+            <value> <string>One group must be set when function is accountant manager or agent</string> </value>
+        </item>
+        <item>
+            <key> <string>message_arity_too_small</string> </key>
+            <value> <string>One group must be set when function is accountant manager or agent</string> </value>
+        </item>
+        <item>
+            <key> <string>message_arity_with_portal_type_not_in_range</string> </key>
+            <value> <string>One group must be set when function is accountant manager or agent</string> </value>
+        </item>
+        <item>
+            <key> <string>message_arity_with_portal_type_too_small</string> </key>
+            <value> <string>One group must be set when function is accountant manager or agent</string> </value>
+        </item>
+        <item>
+            <key> <string>min_arity</string> </key>
+            <value> <int>1</int> </value>
+        </item>
+        <item>
+            <key> <string>string_index</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
+        <item>
+            <key> <string>test_method_id</string> </key>
+            <value>
+              <tuple/>
+            </value>
+        </item>
+        <item>
+            <key> <string>test_tales_expression</string> </key>
+            <value> <string>python: context.isMemberOf(\'function/accounting/manager\') or context.isMemberOf(\'function/accounting/agent\')</string> </value>
+        </item>
+        <item>
+            <key> <string>use_acquisition</string> </key>
+            <value> <int>0</int> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="PersistentMapping" module="Persistence.mapping"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>data</string> </key>
+            <value>
+              <dictionary/>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="3" aka="AAAAAAAAAAM=">
+    <pickle>
+      <global name="PersistentMapping" module="Persistence.mapping"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>data</string> </key>
+            <value>
+              <dictionary/>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>