Fix the v2 image client variable name

image member service client has been separated out in
I6015511511cbf79ff73b48b2546b44e5ea50fdc2
but name os variable was not consistent with other instances.

This is follow up patch to correct those.

Change-Id: Ia357bafb3625933198a00b2ed08ab4c128a27adf
diff --git a/tempest/api/image/v2/test_images_member.py b/tempest/api/image/v2/test_images_member.py
index 9ac708b..6110f23 100644
--- a/tempest/api/image/v2/test_images_member.py
+++ b/tempest/api/image/v2/test_images_member.py
@@ -19,7 +19,7 @@
     @test.idempotent_id('5934c6ea-27dc-4d6e-9421-eeb5e045494a')
     def test_image_share_accept(self):
         image_id = self._create_image()
-        member = self.os_image_member_client.create_image_member(
+        member = self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
         self.assertEqual(member['member_id'], self.alt_tenant_id)
         self.assertEqual(member['image_id'], image_id)
@@ -29,7 +29,7 @@
                                                          self.alt_tenant_id,
                                                          status='accepted')
         self.assertIn(image_id, self._list_image_ids_as_alt())
-        body = self.os_image_member_client.list_image_members(image_id)
+        body = self.image_member_client.list_image_members(image_id)
         members = body['members']
         member = members[0]
         self.assertEqual(len(members), 1, str(members))
@@ -40,7 +40,7 @@
     @test.idempotent_id('d9e83e5f-3524-4b38-a900-22abcb26e90e')
     def test_image_share_reject(self):
         image_id = self._create_image()
-        member = self.os_image_member_client.create_image_member(
+        member = self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
         self.assertEqual(member['member_id'], self.alt_tenant_id)
         self.assertEqual(member['image_id'], image_id)
@@ -54,14 +54,14 @@
     @test.idempotent_id('a6ee18b9-4378-465e-9ad9-9a6de58a3287')
     def test_get_image_member(self):
         image_id = self._create_image()
-        self.os_image_member_client.create_image_member(
+        self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
         self.alt_image_member_client.update_image_member(image_id,
                                                          self.alt_tenant_id,
                                                          status='accepted')
 
         self.assertIn(image_id, self._list_image_ids_as_alt())
-        member = self.os_image_member_client.show_image_member(
+        member = self.image_member_client.show_image_member(
             image_id, self.alt_tenant_id)
         self.assertEqual(self.alt_tenant_id, member['member_id'])
         self.assertEqual(image_id, member['image_id'])
@@ -70,15 +70,15 @@
     @test.idempotent_id('72989bc7-2268-48ed-af22-8821e835c914')
     def test_remove_image_member(self):
         image_id = self._create_image()
-        self.os_image_member_client.create_image_member(
+        self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
         self.alt_image_member_client.update_image_member(image_id,
                                                          self.alt_tenant_id,
                                                          status='accepted')
 
         self.assertIn(image_id, self._list_image_ids_as_alt())
-        self.os_image_member_client.delete_image_member(image_id,
-                                                        self.alt_tenant_id)
+        self.image_member_client.delete_image_member(image_id,
+                                                     self.alt_tenant_id)
         self.assertNotIn(image_id, self._list_image_ids_as_alt())
 
     @test.idempotent_id('634dcc3f-f6e2-4409-b8fd-354a0bb25d83')
@@ -94,7 +94,7 @@
     @test.idempotent_id('cb961424-3f68-4d21-8e36-30ad66fb6bfb')
     def test_get_private_image(self):
         image_id = self._create_image()
-        member = self.os_image_member_client.create_image_member(
+        member = self.image_member_client.create_image_member(
             image_id, member=self.alt_tenant_id)
         self.assertEqual(member['member_id'], self.alt_tenant_id)
         self.assertEqual(member['image_id'], image_id)
@@ -104,6 +104,6 @@
                                                          self.alt_tenant_id,
                                                          status='accepted')
         self.assertIn(image_id, self._list_image_ids_as_alt())
-        self.os_image_member_client.delete_image_member(image_id,
-                                                        self.alt_tenant_id)
+        self.image_member_client.delete_image_member(image_id,
+                                                     self.alt_tenant_id)
         self.assertNotIn(image_id, self._list_image_ids_as_alt())