Release of libvirt-8.4.0

[Jiri Denemark]

The 8.4.0 release of both libvirt and libvirt-python is tagged and
signed tarballs and source RPMs are available at

    https://libvirt.org/sources/
    https://libvirt.org/sources/python/

Thanks everybody who helped with this release by sending patches,
reviewing, testing, or providing feedback. Your work is greatly
appreciated.

* New features

  * qemu: D-Bus display

    Libvirt is now able to setup a D-Bus display export, either with a private
    bus or in p2p mode. This display is available in QEMU 7.0.0.

  * qemu: ppc64 Power10 processor support

    Support for the recently released IBM Power10 processor was added.

  * qemu: Introduce ``absolute`` clock offset

    The ``absolute`` clock offset type allows to set the guest clock to an
    arbitrary epoch timestamp at each start. This is useful if some VM needs
    to be kept set to an arbitrary time for e.g. testing or working around
    broken software.

  * qemu: add qemu-vdagent channel

    This paravirtualized qemu vdagent channel can enable copy and paste between
    a guest and a VNC client. It is available in QEMU 6.1.0.

  * api: Add new APIs ``virDomainSaveParams`` and ``virDomainRestoreParams``

    * ``virDomainSaveParams``: An alternative domain saving API, extends
      ``virDomainSaveFlags`` by adding parameters.
    * ``virDomainRestoreParams``: An alternative domain restoring API, extends
      ``virDomainRestoreFlags`` by adding parameters.

* Bug fixes

  * Improve heuristics for computing baseline CPU models

    Both ``virConnectBaselineHypervisorCPU`` and ``virConnectBaselineCPU`` were
    in some cases computing the result using a CPU model which was newer than
    some of the input models. For example, ``Cascadelake-Server`` was used as a
    baseline for ``Skylake-Server-IBRS`` and ``Cascadelake-Server``. The CPU
    model selection heuristics was improved to choose a more appropriate model.

Enjoy.

Jirka