destroy-environment can take forever when it can't connect

[Aaron Bentley]

$ juju --show-log destroy-environment test-final-release-canonistack
2014-09-04 16:55:40 INFO juju.cmd supercommand.go:37 running juju [1.20.6-trusty-amd64 gc]
2014-09-04 16:55:40 INFO juju.provider.openstack provider.go:204 opening environment "test-final-release-canonistack"
WARNING! this command will destroy the "test-final-release-canonistack" environment (type: openstack)
This includes all machines, services, data and other resources.

Continue [y/N]? y
2014-09-04 16:55:42 INFO juju.conn api.go:270 connecting to API addresses: [10.55.32.8:17070]
2014-09-04 16:55:42 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 16:55:44 INFO juju.provider.openstack provider.go:204 opening environment "test-final-release-canonistack"
2014-09-04 16:55:46 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/"
2014-09-04 16:57:49 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 16:57:54 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/"
2014-09-04 16:59:56 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 17:00:01 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/"
2014-09-04 17:02:04 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 17:02:08 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/"
2014-09-04 17:04:11 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 17:04:15 INFO juju.state.api apiclient.go:242 dialing "wss://10.55.32.8:17070/"
2014-09-04 17:06:18 INFO juju.state.api apiclient.go:250 error dialing "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api": websocket.Dial wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api: dial tcp 10.55.32.8:17070: connection timed out
2014-09-04 17:06:23 INFO juju.state.api apiclient.go:250 error dialing "wss://10.55.32.8:17070/": websocket.Dial wss://10.55.32.8:17070/: dial tcp 10.55.32.8:17070: connection timed out
2014-09-04 17:06:23 WARNING juju.conn api.go:176 discarding API open error: unable to connect to "wss://10.55.32.8:17070/environment/b4013ca6-a6cb-4e9f-80f6-a65f3fdabff2/api"
2014-09-04 17:06:23 ERROR juju.cmd.juju destroyenvironment.go:119 failed to destroy environment "test-final-release-canonistack"

If the environment is unusable, then you may run

    juju destroy-environment --force

to forcefully destroy the environment. Upon doing so, review
your environment provider console for any resources that need
to be cleaned up.

2014-09-04 17:06:23 ERROR juju.cmd supercommand.go:323 cannot connect to API: unable to connect to "wss://10.55.32.8:17070/