Re: [libvirt] PATCH: Fix QEMU arg detection for kvm >= 85

The -help output from KVM >= 85 is now large than we expected. This patch increases the buffer from 8k to 64k when reading help. It also provides more detailed error messages should something go wrong in the future. Two examples of improved error reporting # virsh -c qemu:///system start VirtTest error: Failed to start domain VirtTest error: Unable to read QEMU help output: Value too large for defined data type # virsh -c qemu:///system start VirtTest error: Failed to start domain VirtTest error: internal error cannot parse QEMU version number in 'QEMU PC emulator version 0.9.1 (kvm-79), Copyright (c) 2003-2008 Fabrice Bellard'