Byte encoding of member Id

From stein we will be porting to python3.
To deal with that, when calling for class PartitionCoordinator
the member id need to be encoded in byte format
otherwise it raises MemberNotInGroupError exception.

Closes-Bug: https://storyboard.openstack.org/#!/story/2005894
Change-Id: Idee3216c7c1b4f6391d08649637e619ba1a0ac13

aodh/coordination.py

@@ -18,6 +18,7 @@ import struct
 
 from oslo_config import cfg
 from oslo_log import log
+from oslo_utils import encodeutils
 from oslo_utils import uuidutils
 import six
 import tenacity
@@ -114,7 +115,8 @@ class PartitionCoordinator(object):
         self.backend_url = self.conf.coordination.backend_url
         self._coordinator = None
         self._groups = set()
-        self._my_id = my_id or uuidutils.generate_uuid()
+        self._my_id = my_id or \
+            encodeutils.safe_encode(uuidutils.generate_uuid())
 
     def start(self):
         if self.backend_url:

aodh/tests/unit/test_coordination.py

@@ -193,6 +193,11 @@ class TestPartitioning(base.BaseTestCase):
         self.assertEqual(['group1', 'group2'],
                          sorted(self.shared_storage.keys()))
 
+    def test_member_id(self):
+        agent = 'agent'.encode('ascii')
+        coord = self._get_new_started_coordinator({}, agent)
+        self.assertEqual(agent, coord._my_id)
+
     def test_partitioning(self):
         all_resources = ['resource_%s' % i for i in range(1000)]
         agents = ['agent_%s' % i for i in range(10)]