oe-pkgdata-util: add option for lookup-recipe to not fatally fail

oe-pkgdata-util: add option for lookup-recipe to not fatally fail

It is often useful to run lookup-recipe on a list of packages and get
notifications that there were failures, instead of a fatal error on the first
failure.

This makes it possible to pass long lists of packages to oe-pkgdata-util and
process the output.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>