bitbake: toaster: move layer information reading code

In the processes of removing local system accesses
from toaster UI, we remove the layer data reading
code that was moved to toaster.bbclass, and
adapt the database writing code to read the data
from event sent by the toaster.bbclass

    [YOCTO #5604]

(Bitbake rev: 33b60a940f58e8374a8c7baa9bf28a98f54cdf13)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/orm/models.py

@@ -229,6 +229,7 @@ class Layer(models.Model):
 
 
 class Layer_Version(models.Model):
+    build = models.ForeignKey(Build, related_name='layer_version_build')
     layer = models.ForeignKey(Layer, related_name='layer_version_layer')
     branch = models.CharField(max_length=50)
     commit = models.CharField(max_length=100)