Better logging for frontend config

Removed all the various places where we were appending to the log file.
Why don't we just send all output from the configuration script to a log
file instead? Oh, and set '-x' for bash so we actually know what's going
on.
Fix more credential stuff

* Only create admin keypair once
* hack get_credentials so it can be run multiple times
Remove 'set -x'
Merge pull request #5 from mspaulding06/master

Clean up logging and fix cred stuff