tests should only run when applicable for adv-sg zone in such env

##### ISSUE TYPE

* Documentation Report
* testing/CI

##### COMPONENT NAME

~~~
marvin
~~~

##### CLOUDSTACK VERSION

~~~
4.18
~~~

##### CONFIGURATION

~~~
advanced zone with security groups.
~~~

##### OS / ENVIRONMENT

##### SUMMARY

when an advanced zone with security groups is used to test for regressions, a lot of errors occur.
an example
```
ERROR: test suite for
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/nose/suite.py", line 210, in run
self.setUp()
File "/usr/local/lib/python3.6/site-packages/nose/suite.py", line 293, in setUp
self.setupContext(ancestor)
File "/usr/local/lib/python3.6/site-packages/nose/suite.py", line 316, in setupContext
try_run(context, names)
File "/usr/local/lib/python3.6/site-packages/nose/util.py", line 471, in try_run
return func()
File "/marvin/tests/smoke/test_router_dns.py", line 92, in setUpClass
zoneid=cls.zone.id)
File "/usr/local/lib/python3.6/site-packages/marvin/lib/base.py", line 3562, in create
return Network(apiclient.createNetwork(cmd).__dict__)
File "/usr/local/lib/python3.6/site-packages/marvin/cloudstackAPI/cloudstackAPIClient.py", line 2981, in createNetwork
response = self.connection.marvinRequest(command, response_type=response, method=method)
File "/usr/local/lib/python3.6/site-packages/marvin/cloudstackConnection.py", line 381, in marvinRequest
raise e
File "/usr/local/lib/python3.6/site-packages/marvin/cloudstackConnection.py", line 376, in marvinRequest
raise self.__lastError
File "/usr/local/lib/python3.6/site-packages/marvin/cloudstackConnection.py", line 310, in __parseAndGetResponse
response_cls)
File "/usr/local/lib/python3.6/site-packages/marvin/jsonHelper.py", line 155, in getResultObj
raise cloudstackException.CloudstackAPIException(respname, errMsg)
marvin.cloudstackException.CloudstackAPIException: Execute cmd: createnetwork failed, due to: errorCode: 431, errorText:Only shared guest network can be created in security group enabled zone
```

this is not necessary as we know beforehand that these tests will fail.
Tests need to be properly tagged to not run in these environments.

##### STEPS TO REPRODUCE

~~~

~~~

##### EXPECTED RESULTS

~~~
test will not run
~~~

##### ACTUAL RESULTS

~~~
test runs and fails
~~~

Inizia con marvin/tests/smoke/test_router_dns.py e con la configurazione di TestRouterDns mostrata nel report, quindi esamina gli altri test di regressione che falliscono in una zona avanzata con gruppi di sicurezza. Il lavoro è completato quando i test non applicabili in questo ambiente vengono ignorati invece di essere eseguiti e fallire; verifica il comportamento con la suite di test interessata.

Scritto dal modello di indicizzazione a partire dal testo della issue.