devtool: reset: delete bbappend file if _check_preserve() doesn't
If the .devtool_md5 file doesn't contain a reference to the bbappend
file (e.g. because devtool was interrupted before it could write that
out) then _check_preserve() won't delete it, so we need to delete it
separately because otherwise the recipe won't actually be reset.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
