Fix: Quota show defaults

The ``quota show --default`` command has the URL
``os-quota-sets/{project_id}/defaults`` whereas we used
``os-quota-sets/defaults`` which results in passes "defaults"
as the project ID.
This was uncovered by adding project ID validation in the
cinder quotas API[2].

Closes-Bug: #2107375

[1] https://docs.openstack.org/api-ref/block-storage/v3/#get-default-quotas-for-a-project
[2] https://review.opendev.org/c/openstack/cinder/+/784763

Change-Id: Ibc8a084dbf41f18af28ab5592d9f5638f481c007

openstack/block_storage/v3/_proxy.py

@@ -2024,7 +2024,9 @@ class Proxy(proxy.Proxy):
         res = self._get_resource(
             _quota_set.QuotaSet, None, project_id=project.id
         )
-        return res.fetch(self, base_path='/os-quota-sets/defaults')
+        return res.fetch(
+            self, base_path=(f'/os-quota-sets/{project.id}/defaults')
+        )
 
     def revert_quota_set(self, project, **query):
         """Reset Quota for the project/user.

openstack/tests/unit/block_storage/v3/test_proxy.py

@@ -1176,14 +1176,15 @@ class TestQuotaSet(TestVolumeProxy):
         )
 
     def test_quota_set_get_defaults(self):
+        project_id = 'prj'
         self._verify(
             'openstack.resource.Resource.fetch',
             self.proxy.get_quota_set_defaults,
-            method_args=['prj'],
+            method_args=[project_id],
             expected_args=[
                 self.proxy,
                 False,
-                '/os-quota-sets/defaults',
+                f'/os-quota-sets/{project_id}/defaults',
                 None,
                 False,
             ],

releasenotes/notes/fix-quota-show-defaults-0a8c388926eae18b.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed issue with ``quota show --default`` command by
+    correcting the API URL.