virsh: Obey pool-or-uuid spec when creating volumes
virsh: Obey pool-or-uuid spec when creating volumes

Our documentation says a pool may be referenced by its name or UUID
anywhere if it makes sense (pool-name and pool-uuid are the only
exceptions). However, vol-create and vol-create-as commands did not obey
this.

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