Bump MongoReplicaSetClient's default max_pool_size from 10 to 100. PYTHON-436

Author: A. Jesse Jiryu Davis

test/test_replica_set_client.py

@@ -206,7 +206,7 @@ def test_properties(self):
  self.assertEqual(c.primary, self.primary)
  self.assertEqual(c.hosts, self.hosts)
  self.assertEqual(c.arbiters, self.arbiters)
- self.assertEqual(c.max_pool_size, 10)
+ self.assertEqual(c.max_pool_size, 100)
  self.assertEqual(c.document_class, dict)
  self.assertEqual(c.tz_aware, False)