Unable to probe and enlist a Moonshot chassis in MAAS 1.8.0 (rc3+bzr4000)

[Clark Laughlin]

I am unable to enroll a Moonshot chassis from the web UI (clicking "Add Hardware" | "Chassis"). The following message is displayed in the UI:

{"data":"","status":400,"config":{"transformRequest":[null],"transformResponse":[null],"method":"POST","url":"api/1.0/nodegroups/93ed9845-0072-4a28-aa5b-b01ee853a759/?op=probe_and_enlist_hardware","data":"host=10.36.0.21&username=administrator&password=password&model=mscm","headers":{"Content-Type":"application/x-www-form-urlencoded","Accept":"application/json, text/plain, */*"}}}

I also tried enrolling the chassis from the CLI which also failed:

maas admin node-group probe-and-enlist-hardware $uuid model=mscm host=10.36.0.21 username=Administrator password=password

It failed as well with no visible output from the command and the following in regiond.log:

2015-06-15 06:27:55 [-] 127.0.0.1 - - [15/Jun/2015:11:27:54 +0000] "POST /MAAS/api/1.0/nodegroups/93ed9845-0072-4a28-aa5b-b01ee853a759/?op=probe_and_enlist_hardware HTTP/1.1" 400 - "-" "Python-httplib2/0.8 (gzip)"

Using the deprecated probe-and-enlist-mscm command works:

maas admin node-group probe-and-enlist-mscm $uuid host=10.36.0.21 username=Administrator password=password

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Output of dpkg -l '*maas*'|cat:
http://paste.ubuntu.com/11720549/