The number of times to retry a request to a SNTP server
that has not successfully responded. This retry count is
used for directed SNTP requests in unicast(1) operational mode.
For example, assume this object has been SET to a value of 2.
When the SNTP client queries a given server it will send 1 SNTP
request frame. If that original attempt fails, the client will
retry up to a maximum of 2 more times before giving up and
attempting the next server. Maintaining the value of this
object across agent reboots is REQUIRED.