Configuration.getList returns an immutable list.

This is just like our old Config object.
Add logging to runtime exceptions in Configuration classes.
Provided the CA key password in the ERB template.

Also a couple of miscellaneous fixes like removing an out-dated comment
and suppressing a warning message that was being printed too frequently.
Merge pull request #736 from candlepin/fix_deploy

Configuration.getList returns an immutable list.