networkStartNetwork: Be more verbose
networkStartNetwork: Be more verbose

The lack of debug printings might be frustrating in the future.
Moreover, this function doesn't follow the usual pattern we have in the
rest of the code:

  int ret = -1;
  /* do some work */
  ret = 0;
cleanup:
  /* some cleanup work */
  return ret;

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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