storage_conf: Improve the memory deallocation of pool def parsing
storage_conf: Improve the memory deallocation of pool def parsing

Changes:
    * Free all the strings at "cleanup", instead of freeing them
      in the middle
    * Remove xmlFree
    * s/tmppath/target_path/, to make it more sensible
    * Add new goto label "error"

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