qemu: support qmp on RHEL/CentOS qemu
I'm getting tired of remembering to backport RHEL-specific patches when building upstream libvirt on RHEL 6.x or CentOS. All the affected versions of RHEL qemu-kvm have backported enough patches to a) make JSON useful, and b) modify the -help text to mention libvirt as the preferred interface; which means this string in the help output is a reliable indicator that we can outsmart a strict version check, even when upstream qemu 0.12 lacked the needed features. * src/qemu/qemu_capabilities.c (qemuCapsComputeCmdFlags): Recognize particular help string present when enough features were backported to be worth using JSON. * tests/qemuhelptest.c (mymain): Update tests accordingly.
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