libdnf: upgrade 0.28.1 -> 0.47.0

Add a patch that avoids hardcoded sphinx dependency.

Switch off a couple of new features (zchunk, html docs for
hawkey library via sphinx) that both require new dependencies.

Move from modulemd 1.x to 2.x, drop upstreamed patches.

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>