Fix domain restore for files on root-squash NFS
If qemudDomainRestore fails to open the domain save file, create a pipe, then fork a process that does setuid(qemu_user) and opens the file, then reads this file and stuffs it into the pipe. the parent libvirtd process will use the other end of the pipe as its fd, then reap the child process after it's done reading. This makes domain restore work on a root-squash NFS share that is only visible to the qemu user. * src/qemu/qemu_driver.c: add new qemudOpenAsUID() helper function, and use it in qemudDomainRestore() if reading as root directly failed.
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