Support to build packages with '-p <packageA, packageB,...>' option
support to build all packages in layer with '-l <distro, flock>'
And 'build-pkgs' will scan all buildable packages and build one by one
This commit also support to clean not only the build artifacts under
$MY_BUILD_PKG_DIR/<std/rt>, but also the local build repo
Story: 2008846
Task: 43637
Depends-On: https://review.opendev.org/c/starlingx/tools/+/814104"
Signed-off-by: hbai <haiqing.bai@windriver.com>
Change-Id: I0f9e5537e5dac9f909b4675c986eda4b2e981759
bba10a3b90