Enable JSON and netdev features in QEMU >= 0.13
Enable JSON and netdev features in QEMU >= 0.13

The QEMU 0.13 release is finally out and from testing in RHEL-6
we know that its JSON and netdev features are now good enough
for us to use by default.

* src/qemu/qemu_conf.c: Enable JSON + netdev for QEMU >= 0.13

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