Increase serverpool retry interval within test scenarios

This will hopefully resolve some flakyness where the swapping on the
bookeeping between the list of active/inactive servers occurs too
quickly.

Author: amotl

src/crate/client/test_http.py

@@ -310,7 +310,7 @@ def __init__(self, *args, **kwargs):
 
     def setUp(self):
         self.client = Client(self.servers)
-        self.client.retry_interval = 0.1  # faster retry
+        self.client.retry_interval = 0.2  # faster retry
 
     def tearDown(self):
         self.client.close()