Speed up feeds generation by batching writes

The XML generation underlying our package feeds was doing 1600+ calls to
the write() method on the outfile. For some reason, the Python standard
library insists on calling flush() after every write, which really makes
performance take a nosedive. Wrap the write calls and do them in batches
to remove some of the overhead and make feed generation a bit snappier.

Signed-off-by: Dan McGee <dan@archlinux.org>

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