Fix identity service url for v3

* https://review.openstack.org/#/q/topic:flaskification+(status:open+OR+status:merged)
  removes paste.ini and moves to flask, the service_url is expecting /v3
  in the end otherwise it will return 500 error.
* It also added code for checking status code and use
  requests.exceptions.HTTPError instead of RequestsException.
  It will catch ConnectionErrors or TimeoutErrors and others
  also.

Closes-Bug: #1776301

Change-Id: I6b0310ee5437ff428cc7321035656c7cb4f86773

config_tempest/services/identity.py

@@ -65,10 +65,17 @@ class IdentityService(VersionedService):
             r = requests.get(self.service_url,
                              verify=False,
                              headers={'Accept': 'application/json-home'})
-        except requests.exceptions.RequestException as re:
-            LOG.error("Request on service '%s' with url '%s' failed",
-                      'identity', self.service_url)
-            raise re
+            # check for http status
+            r.raise_for_status()
+        except requests.exceptions.HTTPError:
+            LOG.warning("Request on service '%s' with url '%s' failed, "
+                        "checking for v3", 'identity', self.service_url)
+            if 'v3' not in self.service_url:
+                self.service_url = self.service_url + '/v3'
+                r = requests.get(self.service_url,
+                                 verify=False,
+                                 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()]
         ext = [ex for ex in res if 'ext' in ex]

config_tempest/tests/services/test_identity.py

@@ -54,6 +54,7 @@ class TestIdentityService(BaseServiceTest):
         mocked_requests.return_value = fake_resp
         self.useFixture(MonkeyPatch('requests.get', mocked_requests))
         self.Service.service_url = self.FAKE_URL + "v3"
+        fake_resp.raise_for_status = mock.Mock()
         self.Service.set_identity_v3_extensions()
         self.assertItemsEqual(self.Service.extensions_v3, expected_resp)
         self.assertItemsEqual(self.Service.get_extensions(), expected_resp)