1012022 - allow to override :katello_version config key
1019250: Fix missing/bad system info

Fixed missing system info and fixed system type field. Also, copied memory and
memory_in_gigabytes from  app/models/glue/candlepin/consumer.rb to system info
controller to format memory.
444056 - fixing "update all" api from requiring list of packages
Merge pull request #3248 from jlsherrill/444056

444056 - fixing v2 "update all" api from requiring list of packages
Merge pull request #3241 from daviddavis/1019250

1019250: Showing/fixing system info
Merge pull request #3211 from pitr-ch/bug/1012022

1012022 - allow to override :katello_version config key