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Description of problem:

Based on an email chain with Pavel I am opening this to backport patches for objectCategory to improve performance. 


Patches submitted to upstream:

to be included in the 8.2 rebase but need to be backported to RHEL 7

I opened https://github.com/SSSD/sssd/pull/939 to get objectCategory
patch to upstream.


Other patches:

>     Added these patches:
>     0001-sudo-do-not-update-last-usn-value-on-rules-refresh.patch
>     0002-man-update-sudo-smart-refresh-documentation-to-refle.patch
>     0003-sdap-update-last_usn-on-reconnect.patch
>     0004-sudo-always-use-server-highest-known-usn-for-smart-r.patch


These are part of sssd 2.2 which is in RHEL-8.1. Although there came few
more fixes:

https://pagure.io/SSSD/sssd/issue/3996
https://pagure.io/SSSD/sssd/issue/4085

Upstream PR:
https://github.com/SSSD/sssd/pull/944

Added 8 commits to sssd-1-16:
634c1e0e439783fb11ec58994a97b1412bf3c0fb
fd8865e802661ebc799d3d99dfc9c40137998c66
a1be9af749d08af2fd2f9d0c33b28836b7893072
19e8a02b0e1ddd57784200e519fc5c59141952ee
fb2c54b69e7cc7990f50a93084e5f79fc6216102
3f370ad8c0d2d168a439e37b92c0b7a932e87050
38d00c4b44e18db950fc3d98757fa19cce8454a8
638431001164eeace976ed0d9db62a837a1ee426

This has been verified against sssd-1.16.5-1.el7.x86_64, sudo tests in CI are successful.
https://idm-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/blue/organizations/jenkins/sssd-rhel-prod-tier3/detail/RHEL7.9/5/pipeline/74

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 (sssd 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/RHBA-2020:3904