[Review] Request from 'digitaltom' @ 'SUSE/connect/review_140905_allow_to_set_distro_target_on_update_system_call_2183'

Please review the following changes:
  * c8cf8be allow to set distro_target durin update_system call
  * 44c2ea4 update_system should be able to send all the data as at announce_system (bnc#889778)