Replaces xrange() with range() for py 2/3 compatibility

This patch replaces xrange() in python 2 to range() to
make it compatible with python 3.

Change-Id: Ic257ff77475a5ea8d2b4f00a00d710e296fc3602
diff --git a/manila_tempest_tests/tests/api/admin/test_share_types.py b/manila_tempest_tests/tests/api/admin/test_share_types.py
index 465d8d5..2488317 100644
--- a/manila_tempest_tests/tests/api/admin/test_share_types.py
+++ b/manila_tempest_tests/tests/api/admin/test_share_types.py
@@ -83,7 +83,7 @@
         # Check that backwards compatibility didn't break
         vts = st_list["volume_types"]
         self.assertEqual(len(sts), len(vts))
-        for i in xrange(len(sts)):
+        for i in range(len(sts)):
             self.assertDictMatch(sts[i], vts[i])
 
     @test.attr(type=["gate", "smoke", ])