qemu: Adapt to new log format
qemu: Adapt to new log format

Since 586502189edf9fd0f89a83de96717a2ea826fdb0 qemu commit, the log
lines reporting chardev's path has changed from:

$ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty
char device redirected to /dev/pts/5
char device redirected to /dev/pts/6
char device redirected to /dev/pts/7

to:

$ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty
char device compat_monitor0 redirected to /dev/pts/5
char device serial0 redirected to /dev/pts/6
char device serial1 redirected to /dev/pts/7

However, with current code we are not prepared for such change, which
results in us being unable to start any domain.

nertpinx/libvirt,VenkatDatta/libvirt,taget/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,datto/libvirt,taget/libvirt,libvirt/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,trainstack/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,elmarco/libvirt,trainstack/libvirt,trainstack/libvirt,libvirt/libvirt,elmarco/libvirt,bjzhang/libvirt,crobinso/libvirt,elmarco/libvirt,datto/libvirt,trainstack/libvirt,rlaager/libvirt,bjzhang/libvirt,iam-TJ/libvirt,zippy2/libvirt,libvirt/libvirt,shugaoye/libvirt,jardasgit/libvirt,eskultety/libvirt,iam-TJ/libvirt,trainstack/libvirt,andreabolognani/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,crobinso/libvirt,shugaoye/libvirt,rlaager/libvirt,nertpinx/libvirt,trainstack/libvirt,olafhering/libvirt,crobinso/libvirt,fabianfreyer/libvirt,libvirt/libvirt,eskultety/libvirt,siboulet/libvirt-openvz,fabianfreyer/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,zippy2/libvirt,taget/libvirt,zippy2/libvirt,cbosdo/libvirt,siboulet/libvirt-openvz,datto/libvirt,iam-TJ/libvirt,elmarco/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,siboulet/libvirt-openvz,jardasgit/libvirt,cbosdo/libvirt,nertpinx/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,agx/libvirt,nertpinx/libvirt,datto/libvirt,cbosdo/libvirt,olafhering/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,shugaoye/libvirt,agx/libvirt,datto/libvirt,bjzhang/libvirt,rlaager/libvirt,cbosdo/libvirt,eskultety/libvirt,bjzhang/libvirt,eskultety/libvirt,iam-TJ/libvirt,taget/libvirt,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,nertpinx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,rlaager/libvirt,iam-TJ/libvirt,iam-TJ/libvirt,andreabolognani/libvirt,elmarco/libvirt,agx/libvirt,zippy2/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,olafhering/libvirt,eskultety/libvirt,shugaoye/libvirt,olafhering/libvirt,trainstack/libvirt