Extend has_version function to accept version parameter

We might need not only to check whether the service is supported, but
also whether specific version of the service is working.
Extend functional tests of the block-storage to actually check specific
version.

Change-Id: Ie71c4f818d5adc82466e06d994c258af271b5793

openstack/cloud/openstackcloud.py

@@ -712,9 +712,11 @@ class _OpenStackCloudMixin:
     def get_name(self):
         return self.name
 
-    def get_session_endpoint(self, service_key):
+    def get_session_endpoint(self, service_key, **kwargs):
+        if not kwargs:
+            kwargs = {}
         try:
-            return self.config.get_session_endpoint(service_key)
+            return self.config.get_session_endpoint(service_key, **kwargs)
         except keystoneauth1.exceptions.catalog.EndpointNotFound as e:
             self.log.debug(
                 "Endpoint not found in %s cloud: %s", self.name, str(e))
@@ -731,7 +733,7 @@ class _OpenStackCloudMixin:
                     error=str(e)))
         return endpoint
 
-    def has_service(self, service_key):
+    def has_service(self, service_key, version=None):
         if not self.config.has_service(service_key):
             # TODO(mordred) add a stamp here so that we only report this once
             if not (service_key in self._disable_warnings
@@ -742,7 +744,12 @@ class _OpenStackCloudMixin:
                 self._disable_warnings[service_key] = True
             return False
         try:
-            endpoint = self.get_session_endpoint(service_key)
+            kwargs = dict()
+            # If a specific version was requested - try it
+            if version is not None:
+                kwargs['min_version'] = version
+                kwargs['max_version'] = version
+            endpoint = self.get_session_endpoint(service_key, **kwargs)
         except exc.OpenStackCloudException:
             return False
         if endpoint:

openstack/tests/functional/block_storage/v2/base.py

@@ -22,5 +22,5 @@ class BaseBlockStorageTest(base.BaseFunctionalTest):
         self._set_user_cloud(block_storage_api_version='2')
         self._set_operator_cloud(block_storage_api_version='2')
 
-        if not self.user_cloud.has_service('block-storage'):
+        if not self.user_cloud.has_service('block-storage', '2'):
             self.skipTest('block-storage service not supported by cloud')

openstack/tests/functional/block_storage/v3/base.py

@@ -22,5 +22,5 @@ class BaseBlockStorageTest(base.BaseFunctionalTest):
         self._set_user_cloud(block_storage_api_version='3')
         self._set_operator_cloud(block_storage_api_version='3')
 
-        if not self.user_cloud.has_service('block-storage'):
+        if not self.user_cloud.has_service('block-storage', '3'):
             self.skipTest('block-storage service not supported by cloud')