d/libvirt-doc.doc: install rendered docs
d/libvirt-doc.doc: install rendered docs

- new doc build properly puts all we need into
  debian/tmp/usr/share/doc/libvirt/html/.
  Simplifies many rules (src:docs mostly has .in files nowadays)
- devhelp became devguide and is installed there
- internals (html.in) rendered and installed thre
- kbase (rst) is rendered and installed there
- logos are installed there
- examples directory is there
- this change does not seem to re-introduce
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=492075
- dh_installdocs adds package name, so pull from libvirt/*

Signed-off-by: Christian Ehrhardt <48da28e2c2cd455d60e19b14c46925e20a3c5d5b@canonical.com>

agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian