(foreach_principal): Print error message if `kadm5_get_principals' fails.
(foreach_principal): Print error message if `kadm5_get_principals'
fails.


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@4696 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal