don't query zypper for the base product on class initialization
do less stubbing in yast tests
fix whitespace
Merge pull request #81 from SUSE/review_140526_secure_yast_from_not_calling_zypper

[Review] Request from 'digitaltom' @ 'SUSE/connect/review_140526_secure_yast_from_not_calling_zypper'