Remove debug() implementation; log `try()` messages to STDERR
Remove debug() implementation; log `try()` messages to STDERR

By emitting messages to `STDOUT`, the original implementation would
break anything that tried to capture the output of a call to `try`,
which we do in one place.

Furthermore, we already have a debug mechanism (based off the `$DEBUG`
environment variable, and using `set -x`). More refined log levels can
be work for the future.

Fixes #4380

Signed-off-by: Christopher Maier <b4598f17a90ef80817bae8ad6c37249740caafb4@chef.io>

georgemarshall/habitat,georgemarshall/habitat,habitat-sh/habitat,georgemarshall/habitat,rsertelon/habitat,habitat-sh/habitat,nathenharvey/habitat,georgemarshall/habitat,georgemarshall/habitat,habitat-sh/habitat,nathenharvey/habitat,habitat-sh/habitat,nathenharvey/habitat,rsertelon/habitat,habitat-sh/habitat,nathenharvey/habitat,nathenharvey/habitat,rsertelon/habitat,nathenharvey/habitat,georgemarshall/habitat,rsertelon/habitat,georgemarshall/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat,georgemarshall/habitat