ServersAdminTestJSON dies with Maximum number of fixed ips exceeded

[Mate Lakat]

See http://logs.openstack.org/03/127603/4/check/check-tempest-dsvm-full/61005ed/console.html.gz

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Failed 1 tests - output below:
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setUpClass (tempest.api.compute.admin.test_servers.ServersAdminTestJSON)
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Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "tempest/test.py", line 264, in setUpClass
        cls.resource_setup()
      File "tempest/api/compute/admin/test_servers.py", line 42, in resource_setup
        wait_until='ACTIVE')
      File "tempest/api/compute/base.py", line 244, in create_test_server
        pass
      File "tempest/openstack/common/excutils.py", line 68, in __exit__
        six.reraise(self.type_, self.value, self.tb)
      File "tempest/api/compute/base.py", line 234, in create_test_server
        server['id'], kwargs['wait_until'])
      File "tempest/services/compute/json/servers_client.py", line 183, in wait_for_server_status
        ready_wait=ready_wait)
      File "tempest/common/waiters.py", line 77, in wait_for_server_status
        server_id=server_id)
    BuildErrorException: Server %(server_id)s failed to build and is in ERROR status
    Details: Server 819fcdde-babb-4f65-8320-12dfb05cc899 failed to build and is in ERROR status
    Details: {u'created': u'2014-10-17T14:38:23Z', u'message': u'Build of instance ...
      ...819fcdde-babb-4f65-8320-12dfb05cc899 aborted: ...
      ...Failed to allocate the network(s) with error Maximum number of...
      ...fixed ips exceeded, not rescheduling.', u'code': 500}