Config unification

Replace Candlepin's Config class with Configuration from common. No more ```new Config()``` in mainline code, rely on injection of Configuration from Guice.

TEST
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Simply do what you normally do to use Candlepin.

NOTE: I did not update Gutterball.
I'm going to remove the log.debug statements that printout the passphrase altogether. If we want to know it we can use the debugger or add in debug logging when debugging. I don't see them being that helpful in production.