Moving API microversion fixture in resource_setup

API microversion fixture is used to set the API
microversion on service client and reset it back
after test execution. That is done in setUp()
method and due to that API microversion is not
set on service client during resource_setup()
method and any API call will be requested on base
version.

To sync the complete test execution of test class
with requested API microversion, this commit moves
the API microversion setting in resource_setup()
method.

Closes-Bug: #1881863

Change-Id: Ia4b884a79cc0e50057dd57090737332bd76da37e
diff --git a/tempest/test.py b/tempest/test.py
index 8ea3b16..bf0aba4 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -27,6 +27,7 @@
 from tempest.common import utils
 from tempest import config
 from tempest.lib import base as lib_base
+from tempest.lib.common import api_microversion_fixture
 from tempest.lib.common import fixed_network
 from tempest.lib.common import profiler
 from tempest.lib.common import validation_resources as vr
@@ -480,6 +481,34 @@
         pass
 
     @classmethod
+    def setup_api_microversion_fixture(
+            cls, compute_microversion=None, volume_microversion=None,
+            placement_microversion=None):
+        """Set up api microversion fixture on service clients.
+
+        `setup_api_microversion_fixture` is used to set the api microversion
+        on service clients. This can be invoked from resource_setup() method.
+
+        Example::
+
+            @classmethod
+            def resource_setup(cls):
+                super(MyTest, cls).resource_setup()
+                cls.setup_api_microversion_fixture(
+                    compute_microversion=cls.compute_request_microversion,
+                    volume_microversion=cls.volume_request_microversion,
+                    placement_microversion=cls.placement_request_microversion)
+
+        """
+
+        api_fixture = api_microversion_fixture.APIMicroversionFixture(
+            compute_microversion=compute_microversion,
+            volume_microversion=volume_microversion,
+            placement_microversion=placement_microversion)
+        api_fixture.setUp()
+        cls.addClassResourceCleanup(api_fixture._reset_microversion)
+
+    @classmethod
     def resource_setup(cls):
         """Class level resource setup for test cases.