patches: Add backports

Specifically

  * backport/qemu_domain-Don-t-unref-NULL-hash-table-in-qemuDomainRefr.patch

which Closes: #1030671 and

  * backport/qemu-Jump-to-cleanup-label-on-umount-failure.patch
  * backport/qemu_namespace-Deal-with-nested-mounts-when-umount-ing-de.patch
  * backport/qemuProcessRefreshDisks-Don-t-skip-filling-of-disk-inform.patch
  * backport/qemu_extdevice-Do-cleanup-host-only-for-VIR_DOMAIN_TPM_TY.patch
  * backport/qemu-blockjob-Handle-pending-blockjob-state-only-when-we-.patch
  * backport/rpc-client-Don-t-check-return-value-of-virNetMessageNew.patch
  * backport/rpc-Don-t-warn-about-max_client_requests-in-single-thread.patch

which address some other random issues.