lib/oe/recipeutils: refactor patch_recipe_file() to use edit_metadata()
Use bb.utils.edit_metadata() to replace some of the logic in this
function; this avoids us effectively having two implementations of the
same thing. In the process fix the following issues:
* Insert values before any leading comments for the next variable
instead of after them
* Insert overridden variables (e.g. RDEPENDS_${PN}) in the correct place
* Properly handle replacing varflag settings (e.g. SRC_URI[md5sum])
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
