adjust search so that it works for non-admin users

Non-admin user can now search for:
- hosts
- hostgroups
- netgroups
- servers
- services

(Fixes ACI issue where search returns nothing when user does't have
read rights for an attribute in search_attributes.

https://fedorahosted.org/freeipa/ticket/5167

Reviewed-By: Tomas Babej <tbabej@redhat.com>

ipalib/plugins/hostgroup.py

@@ -78,6 +78,7 @@ class hostgroup(LDAPObject):
     object_name_plural = _('host groups')
     object_class = ['ipaobject', 'ipahostgroup']
     permission_filter_objectclasses = ['ipahostgroup']
+    search_attributes = ['cn', 'description', 'member', 'memberof']
     default_attributes = ['cn', 'description', 'member', 'memberof',
         'memberindirect', 'memberofindirect',
     ]