use concurrent runner and add min server version

Author: blink1073

test/asynchronous/test_discovery_and_monitoring.py

@@ -452,7 +452,7 @@ async def mock_close(self, reason):
 
 
 class TestPoolBackpressure(AsyncIntegrationTest):
-    # @async_client_context.require_version_min(8, 0, 0)
+    @async_client_context.require_version_min(7, 0, 0)
     async def test_connection_pool_is_not_cleared(self):
         listener = CMAPListener()
 

test/test_discovery_and_monitoring.py

@@ -450,7 +450,7 @@ def mock_close(self, reason):
 
 
 class TestPoolBackpressure(IntegrationTest):
-    # @client_context.require_version_min(8, 0, 0)
+    @client_context.require_version_min(7, 0, 0)
     def test_connection_pool_is_not_cleared(self):
         listener = CMAPListener()