The value of tmnxNtpAuthCheck specifies whether or not to
skip the rejection of NTP PDUs that do not match the
authentication key or authentication type requirements.
When tmnxNtpAuthCheck has a value of 'true', authentication
PDUs are generated and NTP PDUs are authenticated upon
receipt. Mismatches cause a counter to be incremented for
a type mismatch and a counter for a key value mismatch.
This scalar object was made obsolete in R8.0; it was replaced by
tmnxNtpConfigAuthCheck.