devtool/friends: Use LAYERSERIES_CORENAMES when generating LAYERSERIES_COMPAT entries

It seems some layers want to subvert the intent of LAYERSERIES_COMPAT
so bitbake is going to have to become stricter about the values there.
To work with this, use LAYERSERIES_CORENAMES to generate the entries in
LAYERSERIES_COMPAT instead of the current magic LAYERSERIES_COMPAT_core
value which may not continue to work.

The downside to this is when migating between releases, people would
need to update devtool workspace layer.conf files. I guess you could
argue this is a feature!

(From OE-Core rev: 96ff9baa8ead57504f40f362ed3a4aaa776d1b58)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/commands.py

@@ -300,6 +300,7 @@ def get_test_layer():
 
 def create_temp_layer(templayerdir, templayername, priority=999, recipepathspec='recipes-*/*'):
     os.makedirs(os.path.join(templayerdir, 'conf'))
+    corenames = get_bb_var('LAYERSERIES_CORENAMES')
     with open(os.path.join(templayerdir, 'conf', 'layer.conf'), 'w') as f:
         f.write('BBPATH .= ":${LAYERDIR}"\n')
         f.write('BBFILES += "${LAYERDIR}/%s/*.bb \\' % recipepathspec)
@@ -308,7 +309,7 @@ def create_temp_layer(templayerdir, templayername, priority=999, recipepathspec=
         f.write('BBFILE_PATTERN_%s = "^${LAYERDIR}/"\n' % templayername)
         f.write('BBFILE_PRIORITY_%s = "%d"\n' % (templayername, priority))
         f.write('BBFILE_PATTERN_IGNORE_EMPTY_%s = "1"\n' % templayername)
-        f.write('LAYERSERIES_COMPAT_%s = "${LAYERSERIES_COMPAT_core}"\n' % templayername)
+        f.write('LAYERSERIES_COMPAT_%s = "%s"\n' % (templayername, corenames))
 
 @contextlib.contextmanager
 def runqemu(pn, ssh=True, runqemuparams='', image_fstype=None, launch_cmd=None, qemuparams=None, overrides={}, discard_writes=True):