Dump the debug buffer to libvirtd.log on fatal signal
Dump the debug buffer to libvirtd.log on fatal signal

In case of imminent crash or upon request (signal USR2),
dump the logging buffer to the libvirtd.log file for
post-mortem analysis
* daemon/libvirtd.c: create a sig_fatal() handler connected to
  SIGFPE SIGSEGV SIGILL SIGABRT SIGBUS and SIGUSR2, just dumping
  the log buffer using virLogEmergencyDumpAll

rlaager/libvirt,emaste/libvirt,jardasgit/libvirt,elmarco/libvirt,eskultety/libvirt,wiedi/libvirt,soulxu/libvirt-xuhj,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,siboulet/libvirt-openvz,emaste/libvirt,rbu/libvirt,leilihh/libvirt,usc-isi/libvirt,leilihh/libvirt,cbosdo/libvirt,rmarwaha/libvirt,agx/libvirt,novel/fbsd-libvirt,fabianfreyer/libvirt,iam-TJ/libvirt,VenkatDatta/libvirt,warewolf/libvirt,danwent/libvirt-ovs,kantai/libvirt-vfork,siboulet/libvirt-openvz,foomango/libvirt,shugaoye/libvirt,bjzhang/libvirt,wiedi/libvirt,warewolf/libvirt,warewolf/libvirt,dumbbell/libvirt,rmarwaha/libvirt,rlaager/libvirt,warewolf/libvirt,nertpinx/libvirt,trainstack/libvirt,iam-TJ/libvirt,nertpinx/libvirt,nertpinx/libvirt,rmarwaha/libvirt1,rbu/libvirt,rmarwaha/libvirt1,emaste/libvirt,agx/libvirt,bjzhang/libvirt,danwent/libvirt-ovs,jeckersb/libvirt,jfehlig/libvirt,jeckersb/libvirt,andreabolognani/libvirt,trainstack/libvirt,dumbbell/libvirt,taget/libvirt,datto/libvirt,jardasgit/libvirt,zippy2/libvirt,crobinso/libvirt,jeckersb/libvirt,warewolf/libvirt,zhlcindy/libvirt-1.1.4-maintain,rbu/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,shugaoye/libvirt,emaste/libvirt,rmarwaha/libvirt1,danwent/libvirt-ovs,shugaoye/libvirt,dumbbell/libvirt,elmarco/libvirt,crobinso/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,leilihh/libvirt,cbosdo/libvirt,foomango/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,libvirt/libvirt,rlaager/libvirt,rmarwaha/libvirt1,usc-isi/libvirt,kantai/libvirt-vfork,danwent/libvirt-ovs,libvirt/libvirt,crobinso/libvirt,usc-isi/libvirt,wiedi/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,olafhering/libvirt,jeckersb/libvirt,shugaoye/libvirt,novel/fbsd-libvirt,bjzhang/libvirt,trainstack/libvirt,kantai/libvirt-vfork,novel/fbsd-libvirt,taget/libvirt,trainstack/libvirt,jardasgit/libvirt,agx/libvirt,zippy2/libvirt,novel/fbsd-libvirt,dumbbell/libvirt,rmarwaha/libvirt1,siboulet/libvirt-openvz,crobinso/libvirt,leilihh/libvirt,fabianfreyer/libvirt,leilihh/libvirt,VenkatDatta/libvirt,wiedi/libvirt,datto/libvirt,trainstack/libvirt,fabianfreyer/libvirt,trainstack/libvirt,nertpinx/libvirt,jeckersb/libvirt,jeckersb/libvirt,warewolf/libvirt,taget/libvirt,cbosdo/libvirt,olafhering/libvirt,olafhering/libvirt,rmarwaha/libvirt,foomango/libvirt,jfehlig/libvirt,wiedi/libvirt,eskultety/libvirt,kantai/libvirt-vfork,danwent/libvirt-ovs,rlaager/libvirt,andreabolognani/libvirt,rmarwaha/libvirt,foomango/libvirt,trainstack/libvirt,warewolf/libvirt,soulxu/libvirt-xuhj,datto/libvirt,emaste/libvirt,rlaager/libvirt,dumbbell/libvirt,jeckersb/libvirt,rmarwaha/libvirt,rmarwaha/libvirt1,wiedi/libvirt,datto/libvirt,rbu/libvirt,VenkatDatta/libvirt,leilihh/libvirt,zippy2/libvirt,foomango/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,jfehlig/libvirt,rbu/libvirt,libvirt/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,zippy2/libvirt,soulxu/libvirt-xuhj,jardasgit/libvirt,usc-isi/libvirt,novel/fbsd-libvirt,elmarco/libvirt,rmarwaha/libvirt,jfehlig/libvirt,soulxu/libvirt-xuhj,wiedi/libvirt,agx/libvirt,soulxu/libvirt-xuhj,siboulet/libvirt-openvz,bjzhang/libvirt,iam-TJ/libvirt,datto/libvirt,taget/libvirt,bjzhang/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,VenkatDatta/libvirt,siboulet/libvirt-openvz,novel/fbsd-libvirt,emaste/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,agx/libvirt,kantai/libvirt-vfork,emaste/libvirt,olafhering/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,usc-isi/libvirt,libvirt/libvirt,elmarco/libvirt,dumbbell/libvirt,shugaoye/libvirt