qemu: convert qemuLogOperation to take a qemuDomainLogContextPtr
qemu: convert qemuLogOperation to take a qemuDomainLogContextPtr

Instead of writing directly to a log file descriptor, change
qemuLogOperation to use qemuDomainLogContextWrite().

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

olafhering/libvirt,rlaager/libvirt,nertpinx/libvirt,nertpinx/libvirt,datto/libvirt,libvirt/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,olafhering/libvirt,datto/libvirt,VenkatDatta/libvirt,taget/libvirt,andreabolognani/libvirt,nertpinx/libvirt,crobinso/libvirt,eskultety/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jardasgit/libvirt,eskultety/libvirt,crobinso/libvirt,taget/libvirt,rlaager/libvirt,fabianfreyer/libvirt,crobinso/libvirt,datto/libvirt,fabianfreyer/libvirt,zippy2/libvirt,rlaager/libvirt,jfehlig/libvirt,nertpinx/libvirt,datto/libvirt,jfehlig/libvirt,zippy2/libvirt,rlaager/libvirt,fabianfreyer/libvirt,taget/libvirt,datto/libvirt,libvirt/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,jardasgit/libvirt,eskultety/libvirt,andreabolognani/libvirt,taget/libvirt,VenkatDatta/libvirt,libvirt/libvirt,zippy2/libvirt,crobinso/libvirt,taget/libvirt,jfehlig/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,rlaager/libvirt