Squashed 'external/devlib/' changes from 8512f116..a8b6e568

a8b6e568 trace: dmesg: Call dmesg -c as root
c92756d6 trace: Fix dmesg collector when using util-linux dmesg

git-subtree-dir: external/devlib
git-subtree-split: a8b6e56874ed9cc5d6c63e747a20d4ae73ab607d