bitbake: doc/lib: Update to use new override syntax containing colons

This runs the overrides conversion script in OE-Core over the bitbake code
base including the docs. A handful of things were excluded in toaster
and for the Changelog file.

(Bitbake rev: 47f8d3b24fd52381bf3b41e2f55a53e57841344c)

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

bitbake/lib/toaster/orm/models.py

@@ -1719,7 +1719,7 @@ class CustomImageRecipe(Recipe):
         """Generate the contents for the recipe file."""
         # If we have no excluded packages we only need to _append
         if self.excludes_set.count() == 0:
-            packages_conf = "IMAGE_INSTALL_append = \" "
+            packages_conf = "IMAGE_INSTALL:append = \" "
 
             for pkg in self.appends_set.all():
                 packages_conf += pkg.name+' '