Juju r2282 cannot deploy or upgrade azure

[Curtis Hovey]

Juju 1.17.2 release candidates have not been able to bootstrap since r2282. The most common reasons are for bootstrap look like this.
    http://162.213.35.54:8080/job/azure-deploy/759/console

2014-01-30 19:20:30 INFO juju.provider.azure environ.go:392 picked tools &{"1.17.2-precise-amd64" "https://jujutools.blob.core.windows.net/juju-tools/testing/tools/releases/juju-1.17.2-precise-amd64.tgz" "407455166d378e98426cc1a2a76375ae2d2b269cef2c93756de9d7ebe0b01b42" %!q(int64=5310991)}
2014-01-30 19:21:50 ERROR juju.provider.common bootstrap.go:140 bootstrap failed: cannot start bootstrap instance: POST request failed (307: Temporary Redirect)
2014-01-30 19:22:12 ERROR juju.cmd supercommand.go:294 cannot start bootstrap instance: POST request failed (307: Temporary Redirect)
Command '('juju', '--show-log', 'bootstrap', '-e', 'test-release-azure2', '--constraints', 'mem=2G')' returned non-zero exit status 1
+ EXIT_STATUS=1

or this http://162.213.35.54:8080/job/azure-deploy/739/console

2014-01-30 08:38:57 INFO juju.provider.azure environ.go:392 picked tools &{"1.17.2-precise-amd64" "https://jujutools.blob.core.windows.net/juju-tools/testing/tools/releases/juju-1.17.2-precise-amd64.tgz" "c60abe982aeeb46beb1c03820e8bf53ba220991ebdf59990919fcd79d03a1fb1" %!q(int64=5252511)}
 - juju-test-release-azure2-exz3pc4dj8
Waiting for address
Attempting to connect to 10.0.0.4:22
Attempting to connect to juju-test-release-azure2-exz3pc4dj8.cloudapp.net:22
2014-01-30 08:42:57 ERROR juju.provider.common bootstrap.go:139 bootstrap failed: getting addresses: GET request failed: MissingOrIncorrectVersionHeader - The versioning header is not specified or was specified incorrectly. (http code 400: Bad Request)
Stopping instance...

Azure health checks using 1.16.5 do not see this problem. This whole problem probably relates to bug 1272558 where instances are not destroyed-properly and interfere with the next test.