Using tools-metadata-url:
http://juju-dist.s3.amazonaws.com/parallel-testing/agents
See which versions we have in streams
$ sstream-query http://juju-dist.s3.amazonaws.com/parallel-testing/agents/streams/v1/com.ubuntu.juju-revision-build-4415-tools.json -o'%(version)s'|sort|uniq
...
1.25.5
1.25.6
2.0-rc2
Bootstrapped into aws using: [2.0-rc1 gc go1.6.2]
(Also have this set: --agent-stream=revision-build-4415)
Upgrade command using 2.0-rc2 binary and these args:
juju --show-log upgrade-juju -m veebers-upgrade-test:controller --version 2.0-rc2
See this output:
http://pastebin.ubuntu.com/23235483/
(Note using 2.0-rc2.1 instead of 2.0-rc2)