secure boot: move pub keys to this git repo

New git repo cgcs-root/public-keys is available now for public
keys used in secure boot process.
This commit moves below keys to this git repo:
  boot_pub_key
  tis-boot.crt
  tis-shim.der
  TiBoot.crt

Please pay attention to that tis-boot.crt(pem) and TiBoot.crt(der)
are the same pub key with different formats in fact, which are used
in different user cases.

Test plan:
 The tests are done with all the changes which involve
 public-keys/integ/root repos for this enhancement about pub keys.
 - PASS: rebuild gurb-efi/efitools/shim packages;
 - PASS: follow the process to build iso image for secure boot;
 - PASS: installation test on AIO-DX lab with secure boot enabled;
 - PASS: check that the CERTS/TiBoot.crt in the disk mounted from
         the efi.img in the iso image is same with the one in
         this git repo.


Story: 2009221
Task: 47358

Signed-off-by: Li Zhou <li.zhou@windriver.com>
Change-Id: I540875293548d4b3e191ea50445ad4dfc5d53a51

README

@@ -0,0 +1,56 @@
+  The keys under this directory are the public keys used in
+the verification process of secure boot process for StarlingX
+debian.
+
+Keys Introduction:
+  tis-boot.crt: it is the public key flashed into BIOS to verify
+    bootx64.efi (signed shim image shimx64.efi) and mmx64.efi
+    (signed shim tool image);
+  tis-shim.der: it is the public key used by shim to verify
+    grubx64.efi (signed grub image);
+  boot_pub_key: it is the public key used by grub to verify signed
+    kernel image and initramfs image and efitools image and so on.
+  TiBoot.crt: it is the same pub key with tis-boot.crt (pem) as a
+    der format. It is installed as /CERTS/TiBoot.crt in the efi.img
+    which is in the iso image.
+
+The following ways can be used to create substitute keys:
+(1)example to create tis-boot.crt/TiBoot.crt
+openssl req -new -x509 -newkey rsa:2048 -keyout BOOT.priv -outform DER -out BOOT.der -days 36500 -subj "/CN=My Boot/" -nodes
+openssl x509 -inform der -in BOOT.der -out BOOT.pem
+cp BOOT.pem tis-boot.crt
+cp BOOT.priv tis-boot.key
+cp BOOT.der TiBoot.crt
+The tis-boot.crt and tis-boot.key are used to sign images mentioned above.
+
+The tis-shim.crt/tis-shim.der/tis-shim.key can be created in the same way.
+
+(2)example to create boot_pub_key
+************
+#!/bin/bash
+key_dir="./"
+priv_key="${key_dir}/BOOT-GPG-PRIVKEY-SecureBootCore"
+pub_key="${key_dir}/BOOT-GPG-KEY-SecureBootCore"
+name_real="SecureBootCore"
+pw="PASSWORD"
+USE_PW="Passphrase: PASSWORD"
+
+cat >"${key_dir}/gen_keyring" <<EOF
+Key-Type: RSA
+Key-Length: 4096
+Name-Real: ${name_real}
+Name-Comment: EXAMPLE
+Name-Email: a@b.com
+Expire-Date: 0
+${USE_PW}
+%commit
+%echo keyring ${name_real} created
+EOF
+
+gpg --homedir "${key_dir}" --batch --yes --gen-key "${key_dir}/gen_keyring"
+gpg --homedir "${key_dir}" -k
+gpg --homedir "${key_dir}" --export --armor "${name_real}" > "${pub_key}"
+gpg --homedir "${key_dir}" --export-secret-keys --pinentry-mode=loopback --passphrase "${pw}" --armor "${name_real}" > "${priv_key}"
+gpg --homedir "${key_dir}" --export "${name_real}" > ${key_dir}/boot_pub_key
+************
+The BOOT-GPG-PRIVKEY-SecureBootCore is used to sign images mentioned above.

tis-boot.crt

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDOjCCAiICCQCndPpvXmatAzANBgkqhkiG9w0BAQUFADBfMQswCQYDVQQGEwJD
+QTEQMA4GA1UECAwHT250YXJpbzEPMA0GA1UEBwwGT3R0YXdhMR8wHQYDVQQKDBZX
+aW5kIFJpdmVyIFN5c3RlbXMgSW5jMQwwCgYDVQQDDANUaVMwHhcNMTYxMjAxMTc1
+OTMwWhcNMjYxMTI5MTc1OTMwWjBfMQswCQYDVQQGEwJDQTEQMA4GA1UECAwHT250
+YXJpbzEPMA0GA1UEBwwGT3R0YXdhMR8wHQYDVQQKDBZXaW5kIFJpdmVyIFN5c3Rl
+bXMgSW5jMQwwCgYDVQQDDANUaVMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
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+xhC3UFkDQ83MlT1vS4ESfNS7o8Cq5Itnhe8MgI6nfPQrp3pgRNSGu8YU9HSCX5SD
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+Mwub8wHuY7hfpw+q3YjksYQvWVErgH3I5Bs6GQpGhat1t1XnFrD17vrif9ri7sbd
+beaISeyk5YCdTJCejXEbpL6GBppaSghtP9wAKtKLzlAz6Ta1GhSzKSVXdHl/JUVG
+7n7gwiP3Sik2ZRVEdKZiODrVb7c8ga1SaiT/dexyKf+Qt3LmMe6QRKGXgsQVSgoI
+0O1WTzpAJRZa1Z6lMOlzpho7rYdAlSIA0tydxx8rOykIPHRItnW/p79WsoQp646F
+cS1ZaZ5XXRtgaO6AAZ+BKJGnie/xl1sNYah7quASYGwADzUpnN4QeiS92YN26eis
+a16FUsgrac0uAQa55IQ=
+-----END CERTIFICATE-----