PYTHON-1188 - Skip test if no replset.

Author: ajdavis

test/test_max_staleness.py

@@ -280,6 +280,7 @@ def test_max_staleness_zero(self):
  self.assertIn("must be greater than 0", str(ctx[0]))
 
  @client_context.require_version_min(3, 3, 6) # SERVER-8858
+ @client_context.require_replica_set
  def test_last_write_date(self):
  # From max-staleness-tests.rst, "Parse lastWriteDate".
  client = rs_or_single_client(heartbeatFrequencyMS=500)