sed: upgrade to 4.2.2

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
scripts/sstate-diff-machines.sh: add simple script to compare sstate checksums between MACHINEs

* takes tmpdir, machines and targets from command arguments or env variables

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
scripts/sstate-sysroot-cruft.sh: add simple script to find files in sysroots not tracked by sstate

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>