[libvirt] This patch creates a mount point for libvirt-lxc containers to mount on the destination system if it does not exist.

[Daniel J Walsh]

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Currently libvirt-lxc checks to see if the destination exists and is a
directory.  If it is not a directory then the mount fails.  Since libvirt-lxc
can bind mount files on an inode, this patch is needed to allow us to bind
mount files on files.  Currently we want to bind mount on top of
/etc/machine-id, and /etc/adjtime

If the destination of the mount point does not exists, it checks if the src is
a directory and then attempts to create a directory, otherwise it creates an
empty file for the destination.  The code will then bind mount over the
destination.

Current code blows up if the destination was not a directory.  We want to be
able to bind mount files on files.

Sorry if you are seeing this patch for the second time, since I sent it to the
wrong list.
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