Use setup_clients classmethod for clients initialization

resource_setup is used to create any resources or objects while
setup_clients is used to initialize clients.

Change-Id: I89110714651fe608721270025dfc0f3c56b078d6
diff --git a/manila_tempest_tests/tests/scenario/manager_share.py b/manila_tempest_tests/tests/scenario/manager_share.py
index 9542515..1893107 100644
--- a/manila_tempest_tests/tests/scenario/manager_share.py
+++ b/manila_tempest_tests/tests/scenario/manager_share.py
@@ -46,8 +46,8 @@
         return self.ip_version == 6
 
     @classmethod
-    def resource_setup(cls):
-        super(ShareScenarioTest, cls).resource_setup()
+    def setup_clients(cls):
+        super(ShareScenarioTest, cls).setup_clients()
 
         # Manila clients
         cls.shares_client = cls.os_primary.share_v1.SharesClient()