qemuDomainBlockCommit: Track virStorageSourcePtr for base
qemuDomainBlockCommit: Track virStorageSourcePtr for base

virStorageFileChainLookup is able to give use virStorageSourcePtr which
contains the pointer to its canonical path. Let's use a more general
virStorageSourcePtr instead of just canonical path.

Former base_canon maps to baseSource->path.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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