Fix pylint warning in test_l3_hamode_db.py
Fix pylint warning in test_l3_hamode_db.py

************* Module neutron.tests.unit.db.test_l3_hamode_db
C:841, 0: Line too long (80/79) (line-too-long)

Trivialfix

Change-Id: I069e6447612d1c00eed8be653d20247064f1896e

huntxu/neutron,eayunstack/neutron,noironetworks/neutron,mahak/neutron,openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,huntxu/neutron,noironetworks/neutron,eayunstack/neutron,openstack/neutron