If you grep the logs, you'll find that you're actually getting quite a few EOF messages from various places.
2017-09-21 19:57:05 DEBUG juju.apiserver request_notifier.go:171 -> [D82] machine-12 31.851599396s {"request-id":90,"error":"cannot get network interfaces of \"wptehh\": getting instance \"wptehh\": unexpected: Get http://10.245.208.33/MAAS/api/2.0/machines/?agent_name=e19034fd-016f-48af-8128-f8aad8ce3de4\u0026id=wptehh: EOF","response":"'body redacted'"} Provisioner[""].SetHostMachineNetworkConfig
2017-09-21 20:04:00 WARNING juju.provider.maas devices.go:462 looking up static routes generated IsUnexpectedError, but didn't match: "unexpected: Get http://10.245.208.33/MAAS/api/2.0/static-routes/: EOF" &errors.Err{message:"", cause:(*gomaasapi.UnexpectedError)(0xc427b83b30), previous:(*errors.Err)(0xc427b83a90), file:"github.com/juju/gomaasapi/errors.go", line:41}
2017-09-21 20:04:00 WARNING juju.provider.maas devices.go:468 error looking up static-routes: unexpected: Get http://10.245.208.33/MAAS/api/2.0/static-routes/: EOF
2017-09-21 20:04:00 DEBUG juju.apiserver.provisioner provisioner.go:963 SetInstanceStatus called with: params.EntityStatusArgs{Tag:"machine-1-lxd-6", Status:"allocating", Info:"failed to start instance (unable to look up static-routes: unexpected: Get http://10.245.208.33/MAAS/api/2.0/static-routes/: EOF), retrying in 10s (10 more attempts)", Data:map[string]interface {}(nil)}

I'm not sure why you're getting EOF for static-routes instead of a 404 if it isn't implemented, or something useful if it is.
Note that we do clearly retry that one, though the retry is at the level of doing all the provisioning steps, AFAICT.

2017-09-21 20:04:41 DEBUG juju.apiserver request_notifier.go:171 -> [DA3] machine-1 30.005683052s {"request-id":183,"error":"Get http://10.245.208.33/MAAS/api/2.0/version/: EOF","response":"'body redacted'"} Provisioner[""].PrepareContainerInterfaceInfo
2017-09-21 20:04:41 DEBUG juju.apiserver request_notifier.go:145 <- [DA3] machine-1 {"request-id":192,"type":"Provisioner","version":4,"request":"SetInstanceStatus","params":"'params redacted'"}
2017-09-21 20:04:41 DEBUG juju.apiserver.provisioner provisioner.go:963 SetInstanceStatus called with: params.EntityStatusArgs{Tag:"machine-1-lxd-6", Status:"allocating", Info:"failed to start instance (Get http://10.245.208.33/MAAS/api/2.0/version/: EOF), retrying in 10s (9 more attempts)", Data:map[string]interface {}(nil)}
2017-09-21 20:05:13 DEBUG juju.apiserver request_notifier.go:171 -> [DAF] machine-18 30.035373959s {"request-id":148,"error":"cannot get provider network config: failed to construct a model from config: unexpected: Get http://10.245.208.33/MAAS/api/2.0/users/?op=whoami: EOF","response":"'body redacted'"} Provisioner[""].SetHostMachineNetworkConfig
2017-09-21 20:05:13 DEBUG juju.apiserver request_notifier.go:145 <- [DAF] machine-18 {"request-id":178,"type":"Provisioner","version":4,"request":"SetInstanceStatus","params":"'params redacted'"}
2017-09-21 20:05:13 DEBUG juju.apiserver.provisioner provisioner.go:963 SetInstanceStatus called with: params.EntityStatusArgs{Tag:"machine-18-lxd-5", Status:"allocating", Info:"failed to start instance (cannot get provider network config: failed to construct a model from config: unexpected: Get http://10.245.208.33/MAAS/api/2.0/users/?op=whoami: EOF), retrying in 10s (10 more attempts)", Data:map[string]interface {}(nil)}
2017-09-21 20:05:22 DEBUG juju.apiserver request_notifier.go:171 -> [DA3] machine-1 30.025484296s {"request-id":195,"error":"unexpected: Get http://10.245.208.33/MAAS/api/2.0/users/?op=whoami: EOF","response":"'body redacted'"} Provisioner[""].PrepareContainerInterfaceInfo
2017-09-21 20:05:22 DEBUG juju.apiserver request_notifier.go:145 <- [DA3] machine-1 {"request-id":196,"type":"Provisioner","version":4,"request":"SetInstanceStatus","params":"'params redacted'"}
2017-09-21 20:05:22 DEBUG juju.apiserver.provisioner provisioner.go:963 SetInstanceStatus called with: params.EntityStatusArgs{Tag:"machine-1-lxd-6", Status:"allocating", Info:"failed to start instance (unexpected: Get http://10.245.208.33/MAAS/api/2.0/users/?op=whoami: EOF), retrying in 10s (8 more attempts)", Data:map[string]interface {}(nil)}


Something seems very unhappy about wptehh in all of that, as it keeps failing over and over (maybe its all just machine-1 and different containers on it, or something).

Do you have any logs from the MAAS controller at the same time? It seems pretty unexpected for it to be giving EOF, which would hint more that something is wrong internally causing MAAS to segfault instead of providing proper HTTP error responses.

Now, all of the log entries that I see appear to be wrapped in a retry, but its entirely possible that we were missing one of them, which is why the bundle deployment failed.
Though I'm pretty surprised to see at least 5 EOF occurrences triggering.

Anyway, looking through the logs I don't see the smoking gun of what actually triggered the failure for deploy, which is a bit of a shame, but I do seem to see a Juju and MaaS that aren't particularly happy together.