Changes

• [CONT] allow to ignore containers by name
  (github issue #260 by Arnaud Rebillout @elboulangero)
• [Kernel] allow glob customization for find kernel image files
  (github issue #297 by @tblancher)

Fixes

• [core] fix warnings if no cgroup could be determined
  (github issue #339 by Aristarkh Zagorodnikov @onyxmaster)