libxl: fix libvirtd crash when reconnecting domains
libxl: fix libvirtd crash when reconnecting domains

More fallout from commit d72ef888.  When reconnecting to running
domains, the libxl_ctx in libxlDomainObjPrivate was used before
initializing it, causing a segfault in libxl and consequently
crashing libvirtd.

Initialize the libxlDomainObjPrivate libxl_ctx in libxlReconnectDomain,
and while at it use this ctx in libxlReconnectDomain instead of the
driver-wide ctx.

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