grub2 security update

[2.02-78.0.3.el8_1.1]

• honor /etc/sysconfig/kernel DEFAULTKERNEL setting for BLS [Orabug: 30643497]
• set EFIDIR as redhat for additional grub2 tools [Orabug: 29875597]
• Update upstream references [Orabug: 26388226]
• Copy symvers.gz to /boot during kernel install [Orabug: 29773086]
• Insert Unbreakable Enterprise Kernel text into BLS config file [Orabug: 29417955]
• fix symlink removal scriptlet, to be executed only on removal [Orabug: 19231481]
• Fix comparison in patch for 18504756
• Remove symlink to grub environment file during uninstall on EFI platforms [Orabug: 19231481]
• update Oracle Linux certificates (Alexey Petrenko)
• Put ‘with’ in menuentry instead of ‘using’ [Orabug: 18504756]
• Use different titles for UEK and RHCK kernels [Orabug: 18504756]
  [2.02-78.el8_1.1]
• grub-set-bootflag: Write new env to tmpfile and then rename (hdegoede)
  Resolves: CVE-2019-14865