Provide a way to specify TLS priority for QEMU TLS connections
(from https://www.spinics.net/linux/fedora/libvirt-users/msg12404.html)
QEMU has -object tls-cipher-suites, but there does not seem to be a way to specify TLS priority in libvirt's qemu.conf. This problem is solvable via compile time --tls-priority flag for QEMU, but that's not very convenient. Please provide a way to provide TLS priority from libvirt's qemu.conf for QEMU TLS connection. This would be equivalent to libvirtd.conf's tls_priority setting, but for QEMU, not for libvirt's own connections.