Test ha_flat_add_compute finished with errors: cinder-manage db sync returned 1

{"build_id": "2014-08-19_18-05-30", "ostf_sha": "c6ecd0137b5d7c1576fa65baef0fc70f9a150daa", "build_number": "457", "auth_required": true, "api": "1.0", "nailgun_sha": "36d27ff737b361f92093986d061bbfc1670bee45", "production": "docker", "fuelmain_sha": "4291004347e406ef187624ea47be192702db353e", "astute_sha": "efe3cb3668b9079e68fb1534fd4649ac45a344e1", "feature_groups": ["mirantis"], "release": "5.1", "fuellib_sha": "e292af206c8d8da242537007b438f8750b5d1efe"}

http://jenkins-product.srt.mirantis.net:8080/view/0_master_swarm/job/master_fuelmain.system_test.ubuntu.thread_4/139/testReport/%28root%29/ha_flat_add_compute/ha_flat_add_compute/

Steps to reproduce
1. Create cluster
2. Add 3 nodes with controller roles
3. Add 2 nodes with compute roles
4. Deploy the cluster
5. Add 1 node with compute role
6. Deploy the cluster

Test ha_flat_add_compute finished with errors:

/returns) 2014-08-19 19:35:52.029 9359 TRACE cinder OperationalError: (OperationalError) (2013, "Lost connection to MySQL server at 'reading initial communication packet', system error
Failed to call refresh: cinder-manage db sync returned 1 instead of one of [0]
cinder-manage db sync returned 1 instead of one of [0]