Raise DuplicateEntry Error when adding a duplicate sudo option

https://fedorahosted.org/freeipa/ticket/1276
https://fedorahosted.org/freeipa/ticket/1277
https://fedorahosted.org/freeipa/ticket/1308

Added new Exception: AttrValueNotFound
Fixed XML Test for Sudorule remove_option
1276 (Raise AttrValueNotFound when trying to remove a non-existent option from Sudo rule)
1277 (Raise DuplicateEntry Error when adding a duplicate sudo option)
1308 (Make sudooption a required option for sudorule_remove_option)

tests/test_xmlrpc/test_sudorule_plugin.py

@@ -316,7 +316,6 @@ class test_sudorule(XMLRPC_test):
         ret = api.Command['sudorule_add_runasgroup'](
             self.rule_name, group=self.test_external_group
         )
-        print ret
         assert ret['completed'] == 1
         failed = ret['failed']
         entry = ret['result']
@@ -330,7 +329,6 @@ class test_sudorule(XMLRPC_test):
         ret = api.Command['sudorule_remove_runasgroup'](
             self.rule_name, group=self.test_external_group
         )
-        print ret
         assert ret['completed'] == 1
         failed = ret['failed']
         entry = ret['result']
@@ -355,7 +353,8 @@ class test_sudorule(XMLRPC_test):
         ret = api.Command['sudorule_remove_option'](
             self.rule_name, ipasudoopt=self.test_option
         )
-        assert ret['result'] is True
+        entry = ret['result']
+        assert 'ipasudoopt' not in entry
 
     def test_a_sudorule_add_host(self):
         """