[integration tests] Check dhcp-agents work test fails with AssertionError

[Georgy Dyuldin]

Test result: https://mirantis.testrail.com/index.php?/tests/view/6073258

Exception:

AssertionError: Amounts of networks for each agent are not nearly equal. assert <bound method TestDHCPAgent.isclose of <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>>(30, 38, abs_tol=3) + where <bound method TestDHCPAgent.isclose of <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>> = <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>.isclose

Trace:

self = <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>

    @pytest.mark.testrail_id('542614')
    def test_to_check_dhcp_agents_work(self):
        """[Neutron VLAN and VXLAN] Check dhcp-agents work

            Steps:
                1. Update quotas for creation a lot of networks:
                    neutron quota-update --network 50 --subnet 50
                                         --router 50 --port 250:
                2. Create max count networks, subnets, launch and terminate
                    instance on each
                3. Get the table with all agents:
                    neutron agent-list
                4. Check networks on each dhcp-agent:
                    neutron net-list-on-dhcp-agent <id_agent_from_the_table>
                    Check that there are nets on all of agent
                5. Check networks quantity on each dhcp-agent:
                    neutron net-list-on-dhcp-agent <id_agent_from_the_table>
                  Check that quantity on agents are nearly equal
            """

        self.set_neutron_quota(network=50, router=50, subnet=50, port=250)
        self.networks = self.create_max_networks_with_instances(self.router)

        # Count networks for each dhcp agent
        # Each agent should contain networks
        # And amount of networks for each agent should be nearly equal
        networks_amount_on_each_agt = []
        for agt_id in self.dhcp_agent_ids:
            amount = len(self.os_conn.neutron.list_networks_on_dhcp_agent(
                         agt_id)['networks'])
            err_msg = "The dhcp agent {} has no networks!".format(agt_id)
            assert amount > 0, err_msg
            networks_amount_on_each_agt.append(amount)
            logger.info('the dhcp agent {0} has {1} networks'.
                        format(agt_id, amount))
        max_value = max(networks_amount_on_each_agt)
        networks_amount_on_each_agt.remove(max_value)
        err_msg = "Amounts of networks for each agent are not nearly equal."
        for value in networks_amount_on_each_agt:
> assert self.isclose(value, max_value, abs_tol=3), err_msg
E AssertionError: Amounts of networks for each agent are not nearly equal.
E assert <bound method TestDHCPAgent.isclose of <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>>(30, 38, abs_tol=3)
E + where <bound method TestDHCPAgent.isclose of <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>> = <mos_tests.neutron.python_tests.test_dhcp_agent.TestDHCPAgent object at 0x7f71edcfe490>.isclose

mos_tests/neutron/python_tests/test_dhcp_agent.py:100: AssertionError