split the formating rules from get_results

split the formating rules from get_results

The osc.core.get_results parses the xml and also construct the status
field in little bit complicate way. For future csv support it is
necessary split the xml parsing and formatting to two functions:
 * get_package_results - returns a dict containing all important
   elements
 * get_results - behave as old implementation, just do a formating only