[Dependencies] Reduce dependency footprint by installing only sssd-common rather than sssd

[gmarciani]

Description of changes

Reduce dependency footprint by installing only sssd-common rather than sssd.
sssd contains sssd-common + other packages that we do not need.
We identified this improvement just now because those unnecessary extra packages were temporarily unavailable in the RHEL repository.

Tests

Manually verified that I can create a RHEL8 cluster integrated with an external MsAD using a custom ami that only has sssd-common installed rather than sssd.

References

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