Make the following improvements to edit_bblayers_conf():
* Support ~ in BBLAYERS entries
* Handle where BBLAYERS items are added over multiple lines with +=
instead of one single long item
Also add some comments documenting the function arguments and return
values as well as a set of bitbake-selftest tests.
(This function is used by the bitbake-layers add, remove and
layerindex-fetch subcommands, as well as devtool when adding the
workspace layer).
(Bitbake master rev: e9a0858023c7671e30cc8ebb08496304b7f26b31)
(Bitbake rev: fca41cf073469493e9dada377fc42d4b084c45c9)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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