Use qemuOpenFile in qemu_driver.c
Use qemuOpenFile in qemu_driver.c

On two places, the usage of open() is replaced with qemuOpenFile as
that is the preferred method in those cases.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=963881

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