CLSA-2021-1632262337 Fix of CVE: CVE-2020-24513, CVE-2020-24489, CVE-2020-24512, CVE-2020-24511

Do not use "grep -q" in a pipe in checkcaveats. - Update Intel CPU microcode to microcode-20210608 release: - Fixes in releasenote.md file. - Update Intel CPU microcode to microcode-20210525 release, addresses CVE-2020-24489, CVE-2020-24511, CVE-2020-24512, and CVE-2020-24513 1962659, 1962709,...