Disable usb tablet support for LXC.
Disable usb tablet support for LXC.

libvirt does not support usb tablets. Disable it
if running libvirt-lxc. Fixes bug 935744

Change-Id: Ic648df4b3a5b66da089c7153971f0e8dd53bacdd
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

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