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
---------
Simply do what you normally do to use Candlepin.

NOTE: I did not update Gutterball.
Apparently it's been like that since 2012 :) 

```
+    <module name="AvoidStarImport">
+        <property name="allowStaticMemberImports" value="true"/>
+    </module>
```