Update error messages in sanity tests

Update error messages throughout sanity tests
to use the same (or similar) format of error message.

Change-Id: I4db0517a5b264151ddaa6ea2c2a04d37e139944e
Related-PROD: #PROD-32415
diff --git a/test_set/cvp-sanity/tests/test_duplicate_ips.py b/test_set/cvp-sanity/tests/test_duplicate_ips.py
index 392838f..ba52f64 100644
--- a/test_set/cvp-sanity/tests/test_duplicate_ips.py
+++ b/test_set/cvp-sanity/tests/test_duplicate_ips.py
@@ -50,5 +50,5 @@
 
         msg = ("\nDuplicate IP addresses found:\n{}"
                "\n\nThe following interfaces are affected:\n{}"
-                "".format(pformat(dup_ips), pformat(dup_ifaces)))
+               "".format(pformat(dup_ips), pformat(dup_ifaces)))
         assert no_dups, msg