test_update_rack
test_update_rack

succeed for alpha columns
reflect new "alphanumeric" error message

quattor/aquilon,stdweird/aquilon,quattor/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,quattor/aquilon