buildall-qemu: automate build testing for qemu MACHINEs

buildall-qemu simplifies the process of build testing an upgraded or
patched recipe by cycling through the build steps for each available qemu
target, with desired LIBC specified by the user as an option (defaulting
to both glibc and musl if no option is provided). While building, a log
file with the name "<recipe>-buildall.log" is written, containing a PASS
or FAIL line upon completion of the build for each architecture. For now,
qemu targets are not selectable (i.e. the recipe is built for all qemu
targets found in meta/conf/machine), but this functionality can be added
in the future along with other useful options.

The log file created by buildall-qemu also includes some basic system
info (e.g. build start time, hostname, host OS, host kernel). Since it is
not guaranteed that tools such as lsb_release will be available on the
host (it isn't by default on my Fedora machine), this information is
collected manually. Additionally, the previous run's log is retained for
comparison by renaming it in the format <recipe>-buildall.log.old once a
new set of builds is triggered for the same recipe.

We've seen multiple variations of this concept in use as one-liners and
as bash functions in dotfiles, so it seemed appropriate to submit it in
script form to oe-core for everyone to use.

Sample log output:

BUILDALL-QEMU LOG FOR aspell
START TIME: 2020-02-11_19:50:02
HOSTNAME: yow-tgamblin-fedora2
HOST OS: Fedora 31 (Server Edition)
HOST KERNEL: 5.4.10-200.fc31.x86_64
===============
BUILD RESULTS:
[glibc]
PASS: qemuarmv5
PASS: qemux86
PASS: qemuppc
PASS: qemumips64
PASS: qemux86-64
PASS: qemumips
PASS: qemuarm
PASS: qemuarm64
PASS: qemuriscv64
[musl]
PASS: qemuarmv5
PASS: qemux86
PASS: qemuppc
PASS: qemumips64
PASS: qemux86-64
FAIL: qemumips
FAIL: qemuarm
FAIL: qemuarm64
FAIL: qemuriscv64
===============
PASSED: 14
FAILED: 4

(From OE-Core rev: ee64b7db6651df4ed419e3d2649b4fb2f2faf830)

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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