Add support of lxc-info 1.0.0beta1.

I'm running a debian host with lxc1.0.0beta1 (from unstable).
Some commands fails because of the updated output of lxc-info.
I just updated the regexp to ignore case.

For history, here is the new output.

    State:          RUNNING
    PID:            2
    IP:             192.168.x.x
    CPU use:        xx seconds
    Link:           vethxx
     TX bytes:      xx KiB
     RX bytes:      xx KiB
     Total bytes:   xx KiB