Fix tempest router timestamp test when HA enabled

When run in an HA or DVR configured environment,
the test_show_router_attribute_with_timestamp API
test can fail with an 'updated_at' timestamp mismatch.

The test should check if the timestamp is >= since
post-creation code could update the object.

Closes-bug: #1679794

Change-Id: I3c58af022d1699ab05ca964b6d957dae39cf1ccc
1 file changed
tree: 65e25ea4c495b418df70f64f609cdf8b03f07929
  1. neutron/