Provide more graceful error handling

[kvick]

During provision and tagging operations, we can sometimes get some pretty verbose stack traces that don't mean much to end-users.

Consider adding some checked Exceptions (that also may help us identify retryable operations) that provide friendlier messages to end users. We should maintain some verbose stacktraces/logging for backend analysis

Another area to investigate is to make sure that if a provisioner returns a non-zero exit, that we should fail the amination so we don't incorrectly aminate something.