Add V2 Nova API os-quota-sets tests

This patch adds V2 Nova API - os-quota-sets delete tests.

Change-Id: If6f96e6e6d253dbb11cead0ba2aebbb37fa6984e
diff --git a/tempest/api/compute/admin/test_quotas.py b/tempest/api/compute/admin/test_quotas.py
index 81b0328..0fed20f 100644
--- a/tempest/api/compute/admin/test_quotas.py
+++ b/tempest/api/compute/admin/test_quotas.py
@@ -93,6 +93,29 @@
         self.assertEqual(200, resp.status)
         self.assertEqual(quota_set['ram'], 5120)
 
+    @test.attr(type='gate')
+    def test_delete_quota(self):
+        # Admin can delete the resource quota set for a tenant
+        tenant_name = data_utils.rand_name('ram_quota_tenant_')
+        tenant_desc = tenant_name + '-desc'
+        identity_client = self.os_adm.identity_client
+        _, tenant = identity_client.create_tenant(name=tenant_name,
+                                                  description=tenant_desc)
+        tenant_id = tenant['id']
+        self.addCleanup(identity_client.delete_tenant, tenant_id)
+        resp, quota_set_default = self.adm_client.get_quota_set(tenant_id)
+        ram_default = quota_set_default['ram']
+
+        resp, body = self.adm_client.update_quota_set(tenant_id, ram='5120')
+        self.assertEqual(200, resp.status)
+
+        resp, body = self.adm_client.delete_quota_set(tenant_id)
+        self.assertEqual(202, resp.status)
+
+        resp, quota_set_new = self.adm_client.get_quota_set(tenant_id)
+        self.assertEqual(200, resp.status)
+        self.assertEqual(ram_default, quota_set_new['ram'])
+
 
 class QuotasAdminTestXML(QuotasAdminTestJSON):
     _interface = 'xml'
diff --git a/tempest/services/compute/json/quotas_client.py b/tempest/services/compute/json/quotas_client.py
index 7607cc0..998177f 100644
--- a/tempest/services/compute/json/quotas_client.py
+++ b/tempest/services/compute/json/quotas_client.py
@@ -100,3 +100,7 @@
 
         body = json.loads(body)
         return resp, body['quota_set']
+
+    def delete_quota_set(self, tenant_id):
+        """Delete the tenant's quota set."""
+        return self.delete('os-quota-sets/%s' % str(tenant_id))
diff --git a/tempest/services/compute/xml/quotas_client.py b/tempest/services/compute/xml/quotas_client.py
index eb287c2..8fbae39 100644
--- a/tempest/services/compute/xml/quotas_client.py
+++ b/tempest/services/compute/xml/quotas_client.py
@@ -124,3 +124,7 @@
         body = xml_to_json(etree.fromstring(body))
         body = self._format_quota(body)
         return resp, body
+
+    def delete_quota_set(self, tenant_id):
+        """Delete the tenant's quota set."""
+        return self.delete('os-quota-sets/%s' % str(tenant_id))