make tempest work under py3

use the -E for sudo when running testr
this will pass the PYTHON environment variable
so python3 will run

Change-Id: I231090694fafb8dcc71c9595174ba82185b59348

vitrage_tempest_tests/tests/api/base.py

@@ -17,6 +17,7 @@ import traceback
 
 from oslo_log import log as logging
 from oslotest import base
+from six.moves import filter
 
 from vitrage.common.constants import EdgeProperties
 from vitrage.common.constants import EntityCategory
@@ -78,7 +79,7 @@ class BaseApiTest(base.BaseTestCase):
         count = 0
 
         while count < 40:
-            LOG.info("wait_for_client - " + client_func.func_name)
+            LOG.info("wait_for_client - " + client_func.__name__)
             client = client_func(conf)
             if client:
                 return client
@@ -126,7 +127,7 @@ class BaseApiTest(base.BaseTestCase):
         host = filter(
             lambda item: item[VProps.VITRAGE_TYPE] == NOVA_HOST_DATASOURCE,
             topology['nodes'])
-        return host[0]
+        return next(host)
 
     def _create_instances(self, num_instances, set_public_network=False):
         kwargs = {}
@@ -377,9 +378,10 @@ class BaseApiTest(base.BaseTestCase):
         public_nets = filter(
             lambda item: self._get_value(item, VProps.NAME) == 'public',
             networks['networks'])
-        if not public_nets:
+        try:
+            return next(public_nets)
+        except StopIteration:
             return None
-        return public_nets[0]
 
     def _print_entity_graph(self):
         api_graph = self.vitrage_client.topology.get(all_tenants=True)

vitrage_tempest_tests/tests/api/datasources/test_static_physical.py

@@ -67,14 +67,14 @@ class TestStaticPhysical(BaseApiTest):
 
         # template file
         file_path = '/etc/vitrage/static_physical_configuration.yaml'
-        with open(file_path, 'rb') as f:
+        with open(file_path, 'r') as f:
             template_data = f.read()
         template_data = template_data.replace('tmp-devstack', hostname)
 
         # new file
         new_file = open(
             '/etc/vitrage/static_datasources/'
-            'static_physical_configuration.yaml', 'wb')
+            'static_physical_configuration.yaml', 'w')
         new_file.write(template_data)
         new_file.close()
 

vitrage_tempest_tests/tests/utils.py

@@ -73,7 +73,7 @@ def run_vitrage_command(command, conf):
         LOG.error('error from command %(command)s = %(error)s',
                   {'error': stderr, 'command': full_command})
 
-    return stdout
+    return stdout.decode('utf-8')
 
 
 def get_property_value(environment_name, conf_name, default_value, conf):
@@ -120,7 +120,7 @@ def uni2str(text):
 
 
 def tempest_logger(func):
-    func_name = func.func_name
+    func_name = func.__name__
 
     @wraps(func)
     def func_name_print_func(*args, **kwargs):