Refactor config logic to push configuration logic to one predefined object
Use attr accessor with @ sign
Fix Style issues
Fix feedback from pr#180
Fix test to expect call on SUSE::Connect::Config rather than on RbConfig
Merge pull request #180 from SUSE/review_141006_config_refactoring

[Review] Request from 'KalabiYau' @ 'SUSE/connect/review_141006_config_refactoring'