Merge master@22bcce36fa into kernel.build.lnx.1.0

Imported changes:
  Update kernel-build-tools to ab/7211818
  Update kernel-build-tools to ab/7197542
  OWNERS: add additional owners and drop out smuckle@
  Update kernel-build-tools to ab/7097986
  Add testkey_rsa2048.pem to ${SOONG_OUT}/dist/share/avb
  Remove py3-stdlib
  Add avbtool
  Update kernel-build-tools to ab/7089528

Change-Id: I07ddbe15af2a29868ca7557c21b5e968b253a603
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>