[Tesora DBaaS] Unable to get list of or create new instance after controller deletion

Steps to reproduce:
1. Create new environment with 3 controllers, 1 compute + cinder role, 1 node with Tesora DBaaS role.
2. Deploy envrironment.
3. Delete one controller and deploy environment.

Expected result:
* All plugins resources are migrated to another Controller node
* The environment is redeployed successfully when adding/removing Controller node.

Actual result:
* Unable to create new instance or get list of existing.

Diagnostic snapshot, trove config and logs attached.

Debug log:
root@node-10:/opt/tesora/dbaas/bin# trove --debug list
DEBUG (session:198) REQ: curl -g -i -X GET http://10.109.1.3:5000/v2.0 -H "Accept: application/json" -H "User-Agent: python-keystoneclient"
INFO (connectionpool:203) Starting new HTTP connection (1): 10.109.1.3
DEBUG (connectionpool:383) "GET /v2.0 HTTP/1.1" 200 336
DEBUG (session:215) RESP: [200] content-length: 336 vary: X-Auth-Token server: Apache connection: close date: Thu, 26 May 2016 14:25:00 GMT content-type: application/json x-openstack-request-id: req-1d40af7d-d35b-4882-bb73-2047931bfd1b
RESP BODY: {"version": {"status": "stable", "updated": "2014-04-17T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v2.0+json"}], "id": "v2.0", "links": [{"href": "http://10.109.1.3:5000/v2.0/", "rel": "self"}, {"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}]}}

DEBUG (v2:86) Making authentication request to http://10.109.1.3:5000/v2.0/tokens
INFO (connectionpool:238) Resetting dropped connection: 10.109.1.3
DEBUG (connectionpool:383) "POST /v2.0/tokens HTTP/1.1" 200 4959
DEBUG (iso8601:184) Parsed 2016-05-26T15:25:00.986488Z into {'tz_sign': None, 'second_fraction': u'986488', 'hour': u'15', 'daydash': u'26', 'tz_hour': None, 'month': None, 'timezone': u'Z', 'second': u'00', 'tz_minute': None, 'year': u'2016', 'separator': u'T', 'monthdash': u'05', 'day': None, 'minute': u'25'} with default timezone <iso8601.iso8601.Utc object at 0x7fd9f7ed6590>
DEBUG (iso8601:140) Got u'2016' for 'year' with default None
DEBUG (iso8601:140) Got u'05' for 'monthdash' with default 1
DEBUG (iso8601:140) Got 5 for 'month' with default 5
DEBUG (iso8601:140) Got u'26' for 'daydash' with default 1
DEBUG (iso8601:140) Got 26 for 'day' with default 26
DEBUG (iso8601:140) Got u'15' for 'hour' with default None
DEBUG (iso8601:140) Got u'25' for 'minute' with default None
DEBUG (iso8601:140) Got u'00' for 'second' with default None
DEBUG (iso8601:184) Parsed 2016-05-26T15:25:00.986488Z into {'tz_sign': None, 'second_fraction': u'986488', 'hour': u'15', 'daydash': u'26', 'tz_hour': None, 'month': None, 'timezone': u'Z', 'second': u'00', 'tz_minute': None, 'year': u'2016', 'separator': u'T', 'monthdash': u'05', 'day': None, 'minute': u'25'} with default timezone <iso8601.iso8601.Utc object at 0x7fd9f7ed6590>
DEBUG (iso8601:140) Got u'2016' for 'year' with default None
DEBUG (iso8601:140) Got u'05' for 'monthdash' with default 1
DEBUG (iso8601:140) Got 5 for 'month' with default 5
DEBUG (iso8601:140) Got u'26' for 'daydash' with default 1
DEBUG (iso8601:140) Got 26 for 'day' with default 26
DEBUG (iso8601:140) Got u'15' for 'hour' with default None
DEBUG (iso8601:140) Got u'25' for 'minute' with default None
DEBUG (iso8601:140) Got u'00' for 'second' with default None
DEBUG (session:198) REQ: curl -g -i -X GET http://10.109.1.3:8779/v1.0/c723adf2c5504a86811a75f92bb45920/instances -H "User-Agent: python-keystoneclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}260d8a416d936eed364c459b6e0079a7226c3c7d"
INFO (connectionpool:203) Starting new HTTP connection (1): 10.109.1.3
DEBUG (connectionpool:383) "GET /v1.0/c723adf2c5504a86811a75f92bb45920/instances HTTP/1.1" 503 100
DEBUG (session:215) RESP: [503] date: Thu, 26 May 2016 14:25:01 GMT content-length: 100 content-type: text/plain; charset=UTF-8
RESP BODY: 503 Service Unavailable

The server is currently unavailable. Please try again at a later time.

DEBUG (shell:736) Service Unavailable (HTTP 503)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/troveclient/shell.py", line 731, in main
    sys.argv[1:]))
  File "/usr/lib/python2.7/dist-packages/troveclient/shell.py", line 546, in main
    args.func(self.cs, args)
  File "/usr/lib/python2.7/dist-packages/troveclient/v1/shell.py", line 232, in do_list
    include_clustered=args.include_clustered)
  File "/usr/lib/python2.7/dist-packages/troveclient/v1/instances.py", line 171, in list
    {"include_clustered": include_clustered})
  File "/usr/lib/python2.7/dist-packages/troveclient/base.py", line 70, in _paginated
    resp, body = self.api.client.get(url)
  File "/usr/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 170, in get
    return self.request(url, 'GET', **kwargs)
  File "/usr/lib/python2.7/dist-packages/troveclient/client.py", line 446, in request
    raise exceptions.from_response(resp, body, url)
ServiceUnavailable: Service Unavailable (HTTP 503)
ERROR: Service Unavailable (HTTP 503)