scripts/oe-setup-layers: add a script that restores the layer configuration from a json file

This script can be used directly from poky or oe-core, or can be copied directly
into alayer or any other repository - it is self-suffucient and requires only python3
and git on the host where it will run. It is also copied by the bitbake-layers
layers-setup plugin together with the json, unless requested otherwise.

1. How to restore the layers from the saved configuration:

a) Clone the bootstrap layer or some other repository to obtain the json config and the setup script that can use it.
(use 'bitbake-layers create-layer-setup' from the previous commit to create them)

b) Running with default options:
(note: this will work to update an existing checkout as well)

alex@Zen2:/srv/work/alex/my-build$ meta-alex/setup-layers
Note: not checking out source meta-alex, use --force-bootstraplayer-checkout to override.

Setting up source meta-intel, revision 15.0-hardknott-3.3-310-g0a96edae, branch master
Running 'git init -q /srv/work/alex/my-build/meta-intel'
Running 'git remote remove origin > /dev/null 2>&1; git remote add origin git://git.yoctoproject.org/meta-intel' in /srv/work/alex/my-build/meta-intel
Running 'git fetch -q origin || true' in /srv/work/alex/my-build/meta-intel
Running 'git checkout -q 0a96edae609a3f48befac36af82cf1eed6786b4a' in /srv/work/alex/my-build/meta-intel

Setting up source poky, revision 4.1_M1-372-g55483d28f2, branch akanavin/setup-layers
Running 'git init -q /srv/work/alex/my-build/poky'
Running 'git remote remove origin > /dev/null 2>&1; git remote add origin git://git.yoctoproject.org/poky' in /srv/work/alex/my-build/poky
Running 'git fetch -q origin || true' in /srv/work/alex/my-build/poky
Running 'git remote remove poky-contrib > /dev/null 2>&1; git remote add poky-contrib ssh://git@push.yoctoproject.org/poky-contrib' in /srv/work/alex/my-build/poky
Running 'git fetch -q poky-contrib || true' in /srv/work/alex/my-build/poky
Running 'git checkout -q 11db0390b02acac1324e0f827beb0e2e3d0d1d63' in /srv/work/alex/my-build/poky

2. Command line options:

alex@Zen2:/srv/work/alex/my-build$ meta-alex/setup-layers -h
usage: setup-layers [-h] [--force-bootstraplayer-checkout] [--destdir DESTDIR] [--jsondata JSONDATA]

A self contained python script that fetches all the needed layers and sets them to correct revisions

optional arguments:
  -h, --help            show this help message and exit
  --force-bootstraplayer-checkout
                        Force the checkout of the layer containing this file (by default it is presumed that as this script is in it, the layer is already in place).
  --destdir DESTDIR     Where to check out the layers (default is /srv/work/alex/my-build).
  --jsondata JSONDATA   File containing the layer data in json format (default is /srv/work/alex/my-build/meta-alex/setup-layers.json).

(From OE-Core rev: 58f94471675aef9ac6d15637ac5d8e69cc304c7a)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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