Decode bytes data to string

json in python3.5 requires that json object must be a string, not
byte object. In python2.7 or 3.6 it doesn't matter, it accepts both.

Depends-On: https://review.opendev.org/#/c/702448/
Change-Id: I10a2805b599767cbd1f5553c1640f68c25e85522

config_tempest/services/base.py

@@ -65,7 +65,7 @@ class Service(object):
         if r.status >= 400:
             raise ServiceError("Request on service '%s' with url '%s' failed"
                                " with code %d" % (self.s_type, url, r.status))
-        return r.data
+        return r.data.decode('utf-8')
 
     def set_extensions(self):
         self.extensions = []

config_tempest/services/identity.py

@@ -88,7 +88,8 @@ class IdentityService(VersionedService):
                                  headers={'Accept': 'application/json-home'})
 
         ext_h = 'https://docs.openstack.org/api/openstack-identity/3/ext/'
-        res = [x for x in json.loads(r.content)['resources'].keys()]
+        content = r.content.decode('utf-8')
+        res = [x for x in json.loads(content)['resources'].keys()]
         ext = [ex for ex in res if 'ext' in ex]
         ext = [str(e).replace(ext_h, '').split('/')[0] for e in ext]
         self.extensions_v3 = list(set(ext))

config_tempest/tests/base.py

@@ -270,8 +270,10 @@ class BaseServiceTest(base.BaseTestCase):
             }
         )
 
-        def __init__(self):
+        def __init__(self, bytes_content=False):
             self.content = json.dumps(self.FAKE_V3_EXTENSIONS)
+            if bytes_content:
+                self.content = self.content.encode('utf-8')
 
     class FakeServiceClient(object):
         def __init__(self, services=None):

config_tempest/tests/services/test_base.py

@@ -34,7 +34,7 @@ class TestService(BaseServiceTest):
         expected_resp = mock_http.request('GET',
                                           self.FAKE_URL,
                                           self.FAKE_HEADERS)
-        return expected_resp.data
+        return expected_resp.data.decode('utf-8')
 
     @mock.patch('config_tempest.services.base.urllib3')
     def test_do_get(self, mock_urllib3):

config_tempest/tests/services/test_identity.py

@@ -50,7 +50,7 @@ class TestIdentityService(BaseServiceTest):
     def test_set_identity_v3_extensions(self):
         expected_resp = ['OS-INHERIT', 'OS-OAUTH1',
                          'OS-SIMPLE-CERT', 'OS-EP-FILTER']
-        fake_resp = self.FakeRequestResponse()
+        fake_resp = self.FakeRequestResponse(bytes_content=True)
         mocked_requests = mock.Mock()
         mocked_requests.return_value = fake_resp
         self.useFixture(MonkeyPatch('requests.get', mocked_requests))