[libvirt] [PATCH 0/8] Initial integration of lock managers

This patch series is the bare minimum framework required to integrate with external lock managers. This is a fleshing out of the original proposal in http://www.redhat.com/archives/libvir-list/2010-September/msg00167.html What's in this series * Major refactor of the security drivers to simplify code and clarify interaction with lock maanger * Low level internal lock manager plugin API for locking objects and their resources * High level internal lock manager API for locking virtual machines and their disks * Simple 'no op' plugin impl to stub out all the code * Re-ordering of QEMU startup to add a handshake between libvirtd & the child process, immediately prior to exec(). This allows acquiring locks in the child, before the parent libvirtd process then re-labels disks * The public API header for 3rd parties to implement new lock manager plugins against * Some basic documentation What's not in this series * A standard 'fcntl' based plugin * Enhanced migration process to transfer lock state * Hooks to re-validate the lock at time of VM resume