Spurious "juju run after upgrade succeeded" when deploy_job is run without --upgrade

[Aaron Bentley]

$ ./deploy_job.py charm-testing-joyent ~/sandbox/logs test-job --new-juju-bin /usr/bin
juju --show-log bootstrap -e test-job --constraints mem=2G
2015-04-30 17:08:05 INFO juju.cmd supercommand.go:37 running juju [1.22.1-vivid-amd64 gc]
2015-04-30 17:08:05 WARNING juju.environs config.go:127 Config attribute "tools-metadata-url" (https://swift.canonistack.canonical.com/v1/AUTH_526ad877f3e3464589dc1145dfeaac60/juju-dist/tools) is deprecated.
It is replaced by "agent-metadata-url" attribute.
Your configuration should be updated to set "agent-metadata-url" as follows
agent-metadata-url: https://swift.canonistack.canonical.com/v1/AUTH_526ad877f3e3464589dc1145dfeaac60/juju-dist/tools.

...

2015-04-30 13:13:10 INFO juju run after upgrade succeeded: [{u'MachineId': u'1', u'Stderr': u"Warning: Permanently added '10.112.5.15' (ECDSA) to the list of known hosts.\r\n", u'Stdout': u'Linux\n'}, {u'MachineId': u'2', u'Stderr': u"Warning: Permanently added '10.112.4.236' (ECDSA) to the list of known hosts.\r\n", u'Stdout': u'Linux\n'}]