libvirt security and bug fix update

libvirt-0.9.10-21.0.1.el63.4 - Replace docs/et.png in tarball with blank image libvirt-0.9.10-21.el63.4 - daemon: Fix crash in virTypedParameterArrayClear rhbz844735 - remote: Fix locking in stream APIs rhbz847946 - Using virOnce for global initialization is desirable rhbz847959 - json: Fix...