Comment 5 for bug 1392386

Still reproduced , add one more snapshot
http://jenkins-product.srt.mirantis.net:8080/view/6.0_swarm/job/6.0_fuelmain.system_test.centos.ha_neutron/53/

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "6.0"
  api: "1.0"
  build_number: "49"
  build_id: "2014-12-09_22-41-06"
  astute_sha: "16b252d93be6aaa73030b8100cf8c5ca6a970a91"
  fuellib_sha: "2c99931072d951301d395ebd5bf45c8d401301bb"
  ostf_sha: "a9afb68710d809570460c29d6c3293219d3624d4"
  nailgun_sha: "22bd43b89a17843f9199f92d61fc86cb0f8772f1"
  fuelmain_sha: "3aab16667f47dd8384904e27f70f7a87ba15f4ee"

Steps:
Deploy cluster in HA mode with Neutron VLAN and public network
           assigned to all nodes

        Scenario:
            1. Create cluster
            2. Add 3 nodes with controller role
            3. Add 2 nodes with compute role
            4. Enable assign public networks to all nodes option
            5. Deploy the cluster
            6. Check that public network was assigned to all nodes
            7. Run network verification
            8. Run OSTF

Actual:
Ostf test check network connectivity failed on step delete network

urllib3.connectionpool: DEBUG: "DELETE http://10.108.13.2:9696//v2.0/networks/cd0d89f4-4432-4f89-84e8-7cf9bae2b273.json HTTP/1.1" 500 150
neutronclient.client: DEBUG: RESP:500 CaseInsensitiveDict({'content-length': '150', 'via': '1.1 node-3.test.domain.local:9696', 'connection': 'close', 'date': 'Fri, 12 Dec 2014 06:38:31 GMT', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-2c0ffc59-2412-4fb8-b7f0-b8c6857262fd'}) {"NeutronError": {"message": "Request Failed: internal server error while processing your request.", "type": "HTTPInternalServerError", "detail": ""}}

neutronclient.v2_0.client: DEBUG: Error message: {"NeutronError": {"message": "Request Failed: internal server error while processing your request.", "type": "HTTPInternalServerError", "detail": ""}}
fuel_health.common.test_mixins: DEBUG: Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/fuel_health/common/test_mixins.py", line 186, in verify
    result = func(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/fuel_health/neutronmanager.py", line 117, in _remove_network
    self.neutron_client.delete_network(network['id'])
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 98, in with_params
    ret = self.function(instance, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 359, in delete_network
    return self.delete(self.network_path % (network))
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 1316, in delete
    headers=headers, params=params)
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 1297, in retry_request
    headers=headers, params=params)
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 1251, in do_request
    self._handle_fault_response(status_code, replybody)
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 1216, in _handle_fault_response
    exception_handler_v20(status_code, des_error_body)
  File "/usr/lib/python2.6/site-packages/neutronclient/v2_0/client.py", line 66, in exception_handler_v20
    status_code=status_code)
InternalServerError: Request Failed: internal server error while processing your request.

At the same time we can see that this request failed on step update neutrin db according to DB is locked by someone other

http://paste.openstack.org/show/149846/

*Reproducibility* : Issue often reproduced during bvt and system tests, but not the each time