[BUG] grp.getgrall() in user.py causing performance issue during minion connections

[wcbzero]

Description
On systems with a large number of non-local groups, grp.getgrall() is an expensive operation. When large numbers of minions connect this can cause performance issues, and minion connection timeouts

Setup
(Please provide relevant configs and/or SLS files (be sure to remove sensitive info. There is no general set-up of Salt.)

Please be as specific as possible and give set-up details.

• on-prem machine
• VM (VMWare ESXi)
• OpenLDAP Slapd LDAP Caching Server
• Active Directory with > 1000 groups

Steps to Reproduce the behavior

1. Configure Slapd as a caching server for an Active Directory instance containing more than 1000 groups with Unix GID numbers.
2. Start the salt master
3. Have > 500 Machines connect to the machine
4. Observe large number of slow grp.getgrall() calls

Expected behavior

Only lookups of the groups the user is a member of happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Versions Report

```Salt Version: Salt: 3006.1

Python Version:
Python: 3.8.5 (default, May 27 2021, 13:30:53)

Dependency Versions:
cffi: Not Installed
cherrypy: Not Installed
dateutil: Not Installed
docker-py: 5.0.3
gitdb: Not Installed
gitpython: Not Installed
Jinja2: 3.1.2
libgit2: Not Installed
looseversion: 1.2.0
M2Crypto: Not Installed
Mako: Not Installed
msgpack: 1.0.4
msgpack-pure: Not Installed
mysql-python: Not Installed
packaging: 23.1
pycparser: Not Installed
pycrypto: 3.15.0
pycryptodome: 3.12.0
pygit2: Not Installed
python-gnupg: Not Installed
PyYAML: 6.0
PyZMQ: 25.0.2
relenv: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 4.5.3
ZMQ: 4.3.4

System Versions:
dist: ubuntu 20.04.6 focal
locale: utf-8
machine: x86_64
release: 5.4.0-148-generic
system: Linux
version: Ubuntu 20.04.6 focal

</details>

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[wcbzero]

I created a Patch in PR #64891

[whytewolf]

looking into this and #64953 to try and determine the best coarse of action. right now it is looking like a revert of the code in question. but i want to talk to @nicholasmhughes first. this does not look like it will be in 3006.3.

[nicholasmhughes]

Fixed by #65077