tmnxAdminPassword is used to configure the password which enables
a user to become a system administrator.
tmnxAdminPassword and tmnxAdminPasswordEncrypted, 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 tmnxAdminPassword cannot be more than 20 characters
when the value of tmnxAdminPasswordEncrypted is 'false'.