Let verify command return different return codes depending on results.

Change-Id: Ie49856573dbf5bcf87837c555c046b06c569b3e9

CHANGELOG.rst

@@ -17,6 +17,14 @@ Changelog
 .. Release notes for existing releases are MUTABLE! If there is something that
    was missed or can be improved, feel free to change it!
 
+[x.x.x] - 202x-xx-xx
+--------------------
+
+Changed
+~~~~~
+
+* ``rally verify`` returns 0 on success, 1, 2 or 3 depending on detected issue.
+
 [3.2.0] - 2020-10-30
 --------------------
 

rally/cli/commands/verify.py

@@ -526,6 +526,13 @@ class VerifyCommands(object):
         else:
             print("Verification UUID: %s." % verification_uuid)
 
+        if results["totals"]["unexpected_success"] > 0:
+            return 2
+        if results["totals"]["failures"] > 0:
+            return 3
+
+        return 0
+
     @cliutils.help_group("verification")
     @cliutils.args("--uuid", dest="verification_uuid", type=str, required=True,
                    help="Verification UUID. " + LIST_VERIFICATIONS_HINT)