Making profile explicit

This changes the AWS shell outs to use an explicit profile.  I think the indirection of the env var is confusing and it also seem to not work.

```
15:33:14 A client error (ValidationError) occurred when calling the CompleteLifecycleAction operation: No Lifecycle Hook found with name 'e-d-GetTrackingLogs' for group 'e-d-EdxappServerASGroup-Q9BAAVZLU6K7-v011'
```

This hook does exist, but is not being found because the profile isn't being used for CLI commands.
instead of a function can this be set in the constructor as `self.aws_command`?