New upstream version 6.8.0

AUTHORS

AUTHORS.in

AUTHORS.rst

AUTHORS.rst.in

NEWS.rst

build-aux/check-spacing.pl

build-aux/syntax-check.mk

ci/cirrus/libvirt-freebsd-11.vars

docs/acl.html.in

docs/aclpolkit.html.in

docs/advanced-tests.rst

docs/api.html.in

docs/apps.html.in

docs/best-practices.rst

docs/bindings.html.in

docs/bugs.html.in

docs/coding-style.rst

docs/compiling.html.in

docs/contact.html.in

docs/contribute.html.in