itadm should check the length of alias
cmd - userland programs
Currently itadm accepts aliases of any length, while RFC3270 defines it as:
iSCSI-local-name-value: A UTF-8 string; no null characters are allowed in the string. This encoding is to be used for localized (internationalized) aliases TargetAlias=<iSCSI-local-name-value>
and RFC3271 defines its maximum length as 255.