qemu: Fix warnings in event handlers
qemu: Fix warnings in event handlers

Some qemu monitor event handlers were issuing inadequate warning when
virDomainSaveStatus() failed. They copied the message from I/O error
handler without customizing it to provide better information on why
virDomainSaveStatus() was called.

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