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Description of problem:
When sending traps on SNMP v3 using net-snmp-5.8-20 in RHEL 8.4, the engineTime value remains zero.
This is a problem as the receiving agent does not accept engineTime with a zero value, it expects engineTime and engineBoots values to progress.

snmptrap by default runs the code below to set session.engineBoots and session.engineTime for SNMP v3 traps (not inform).
~~~
         session.engineBoots = 1;
     if (session.engineTime == 0)    /* not really correct, */
         session.engineTime = get_uptime();  /* but it'll work. Sort of. */
~~~

Version-Release number of selected component (if applicable):
net-snmp-5.8-20.el8

How reproducible:
Reproduced by customer

Steps to Reproduce:
1. Sending traps on SNMP v3 using net-snmp-5.8-20 in RHEL 8.4
2. If receiving agent does not accept engineTime with a zero value, it will fail

Actual results:
Unable to send SNMP traps.

Expected results:
Should be able to send SNMP traps.

Additional info:
Upstream patch is already in place for snmptrap binary. It resolves the issue by setting the library engineBoots and engineTime values before sending.
(https://github.com/net-snmp/net-snmp/commit/79f014464ba761e2430cc767b021993ab9379822#diff-7bb7d96d52073a4604dd6ae68d0b691c4b0b891e36f4350f9cf8d52c5b9aea65)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (net-snmp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2021:4439