+++ This bug was initially created as a clone of Bug #1438662 +++

Description of problem:
 
Running tempest, the following tests are failing  

1. tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_stop_start failed

2. tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_suspend_resume

3. tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_subnet_details


Version-Release number of selected component (if applicable):
python-neutron-lib-1.1.0-0.20170213120052.9b3ea8f.el7ost.noarch
openstack-neutron-ml2-10.0.0-5.el7ost.noarch
openstack-neutron-lbaas-10.0.1-0.20170222151526.c6011fb.el7ost.noarch
python-neutronclient-6.1.0-0.20170208193918.1a2820d.el7ost.noarch
openstack-neutron-common-10.0.0-5.el7ost.noarch
openstack-neutron-10.0.0-5.el7ost.noarch
openstack-neutron-openvswitch-10.0.0-5.el7ost.noarch
puppet-neutron-10.3.0-1.el7ost.noarch
python-neutron-10.0.0-5.el7ost.noarch
python-neutron-lbaas-10.0.1-0.20170222151526.c6011fb.el7ost.noarch

How reproducible:
always

Steps to Reproduce:
1. Deploy RH-OSP 11 HA (3 controllers, 2 compute)
2. Run tempest network scenario tests


Actual results:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tempest/test.py", line 103, in wrapper
    return f(self, *func_args, **func_kwargs)
  File "/usr/lib/python2.7/site-packages/tempest/scenario/test_network_advanced_server_ops.py", line 176, in test_server_connectivity_suspend_resume
    server, keypair, floating_ip)
  File "/usr/lib/python2.7/site-packages/tempest/scenario/test_network_advanced_server_ops.py", line 101, in _wait_server_status_and_check_network_connectivity
    self._check_network_connectivity(server, keypair, floating_ip)
  File "/usr/lib/python2.7/site-packages/tempest/scenario/test_network_advanced_server_ops.py", line 94, in _check_network_connectivity
    servers=[server])
  File "/usr/lib/python2.7/site-packages/tempest/scenario/manager.py", line 608, in check_public_network_connectivity
    mtu=mtu)
  File "/usr/lib/python2.7/site-packages/tempest/scenario/manager.py", line 591, in check_vm_connectivity
    msg=msg)
  File "/usr/lib/python2.7/site-packages/unittest2/case.py", line 678, in assertTrue
    raise self.failureException(msg)
AssertionError: False is not true : Timed out waiting for 10.0.0.211 to become reachable

Expected results:
Tests passed 100%

Additional info:

The core of the issue is in kernel, but we can try to work the kernel bug around by enabling arp_accept for all nodes.