[OE-core] Replace foomatic-filters with cups-filters

[Fan Xin]

Hi

I notice that there is foomatic-filters item in packagegroup-core-lsb.bb
file.
The foomatic-filters.bb file is added in 2011 for providing foomatic-rip
to pass LSB commands check.

But the foomatic-rips is moved from foomtic-filters to cups-filters and
maintained by cups-filters according to the cups-filter's NEWS.
(http://bzr.linuxfoundation.org/loggerhead/openprinting/cups-filters/annotate/head:/NEWS)

Now the foomatic-filters package is unmaintained.
(http://www.gossamer-threads.com/lists/gentoo/user/288184)

So I want to replace foomatic-filters with cups-filters in
packagegroup-core-lsb.bb file and replace the foomatic-filters.bb file
with cups-filters.bb file.

How do you think about it?

Best Regards,

Fan