tiup: update sysctl settings

[dveeden]

What is changed, added or deleted? (Required)

• Give a warning about vm.min_free_kbytes as it can lead to boot failures and instability if set on systems with low(er) amounts of memory
• Change tcp_tw_recycle as it isn't available on (most/all) new systems. It is still available on CentOS Linux 7, but that's EOL and not expected for new installations

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[LGTM Timeline notifier]

Timeline:

• 2025-01-24 09:04:08.468601587 +0000 UTC m=+430775.799520987: ☑️ agreed by hfxsd.