[PAVST] Lengthen expirytime to 30s (project-chip#41511)

* Lengthen expirytime to 30s

* Address code comments

* Restyled by autopep8

---------

Co-authored-by: Restyled.io <[email protected]>

Author: marktrayer

src/python_testing/TC_PAVSTTestBase.py

@@ -29,6 +29,8 @@
 
 
 class PAVSTTestBase:
+    DEFAULT_AV_TRANSPORT_EXPIRY_TIME = 30  # 30s
+
     async def read_pavst_attribute_expect_success(self, endpoint, attribute):
         cluster = Clusters.Objects.PushAvStreamTransport
         return await self.read_single_attribute_check_success(endpoint=endpoint, cluster=cluster, attribute=attribute)
@@ -188,7 +190,7 @@ async def validate_allocated_audio_stream(self, audioStreamID):
     async def allocate_one_pushav_transport(self, endpoint, triggerType=Clusters.PushAvStreamTransport.Enums.TransportTriggerTypeEnum.kContinuous,
                                             trigger_Options=None, ingestMethod=Clusters.PushAvStreamTransport.Enums.IngestMethodsEnum.kCMAFIngest,
                                             url="https://localhost:1234/streams/1/", stream_Usage=None, container_Options=None,
-                                            videoStream_ID=None, audioStream_ID=None, expected_cluster_status=None, tlsEndPoint=1, expiryTime=10):
+                                            videoStream_ID=None, audioStream_ID=None, expected_cluster_status=None, tlsEndPoint=1, expiryTime=DEFAULT_AV_TRANSPORT_EXPIRY_TIME):
         endpoint = self.get_endpoint(default=1)
         cluster = Clusters.PushAvStreamTransport