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由 Dawid Zamirski 提交于
* add vboxDriver object to serve as a singleton global object that holds references to IVirtualBox and ISession to be shared among multiple connections. The vbox_driver is instantiated only once in the first call vboxGetDriverConnection function that is guarded by a mutex. * call vbox API initialize only when the first connection is established, and likewise uninitialize when last connection disconnects. The prevents each subsequent connection from overwriting IVirtualBox/ISession instances of any other active connection that led to libvirtd segfaults. The virConnectOpen and virConnectClose implementations are guarded by mutex on the global vbox_driver_lock where the global vbox_driver object counts connectios and decides when it's safe to call vbox's init/uninit routines. * add IVirutalBoxClient to vboxDriver and use it to in tandem with newer pfnClientInitialize/pfnClientUninitalize APIs for vbox versions that support it, to avoid usage of the old pfnComInitialize/Uninitialize.
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