The value of tmnxUserPassword specifies the password used to
authenticate the user for console and FTP access.
tmnxUserPassword and tmnxUserPasswordEncrypted, which indicates
whether or not the password string is encrypted, must be set
together in the same SNMP request PDU or else the set request
will fail with an inconsistentValue error.
The value of tmnxUserPassword cannot be more than 20 characters
when the value of tmnxUserPasswordEncrypted is 'false'.