Reintroduce probe checkpoint flags for kernel version and OS
Reintroduce probe checkpoint flags for kernel version and OS

Removed unintentionally in https://github.com/weaveworks/scope/pull/2148

kinvolk/scope,weaveworks/scope,kinvolk/scope,alban/scope,paulbellamy/scope,alban/scope,alban/scope,weaveworks/scope,weaveworks/scope,paulbellamy/scope,paulbellamy/scope,kinvolk/scope,weaveworks/scope,alban/scope,paulbellamy/scope,weaveworks/scope,weaveworks/scope,kinvolk/scope,kinvolk/scope,paulbellamy/scope,alban/scope,kinvolk/scope,paulbellamy/scope,alban/scope