Add FAQ for troubleshooting selinux policy errors

Description

Some users are experiencing issues where the boot immediately after bootstrap fails due to selinux policy.

Here are the steps to resolve, which should end up in a FAQ:
1. Reboot into single user mode
2. Reinstall selinux-policy-targeted package
3. Touch /.autorelabel
4. Reboot

Acceptance Criteria

None

Labels

None

Epic Link

None

Story Points

2

Components

Assignee

Nick Miller

Sprint

None

Affects versions

Priority

Medium
Configure