Sign each APEX with different container certificate

Each APEX is signed with different certificate. The test certificate
(along with the private key) is com.android.<name>.x509.pem and
com.android.<name>.pk8. The files are in the same directory as the APEX
is defined and is referenced via android_app_certificate module named
com.android.<name>.certificate.

The test certificate could then be overridden via
PRODUCT_CERTIFICATE_OVERRIDES := <apex_module_name>:<new_cert_module_name>

Test: jarsigner -verify -verbose -certs out/target/product/blueline/system/apex/com.android.conscrypt.apex shows
...
X.509, CN=com.android.conscrypt, OU=Android, O=Android, L=Mountain View, ST=California, C=US

Change-Id: I763aa34a4377cc75fe5d61d2a134899aeab73982
diff --git a/apex/Android.bp b/apex/Android.bp
index 50d26c7..7127591 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -19,6 +19,7 @@
     java_libs: ["conscrypt"],
     native_shared_libs: ["libjavacrypto"],
     key: "apex.conscrypt.key",
+    certificate: ":com.android.conscrypt.certificate",
 }
 
 apex_key {
@@ -27,6 +28,11 @@
     private_key: "com.android.conscrypt.pem",
 }
 
+android_app_certificate {
+    name: "com.android.conscrypt.certificate",
+    certificate: "com.android.conscrypt",
+}
+
 // Production APEX
 apex {
     name: "com.android.conscrypt",
diff --git a/apex/com.android.conscrypt.pk8 b/apex/com.android.conscrypt.pk8
new file mode 100644
index 0000000..4c04deb
--- /dev/null
+++ b/apex/com.android.conscrypt.pk8
Binary files differ
diff --git a/apex/com.android.conscrypt.x509.pem b/apex/com.android.conscrypt.x509.pem
new file mode 100644
index 0000000..ba914fa
--- /dev/null
+++ b/apex/com.android.conscrypt.x509.pem
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIF1DCCA7ygAwIBAgIJAN0lMAb+9i0JMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV
+BAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1Nb3VudGFpbiBW
+aWV3MRAwDgYDVQQKDAdBbmRyb2lkMRAwDgYDVQQLDAdBbmRyb2lkMR4wHAYDVQQD
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+MjExNzE2MzdaMH4xCzAJBgNVBAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYw
+FAYDVQQHDA1Nb3VudGFpbiBWaWV3MRAwDgYDVQQKDAdBbmRyb2lkMRAwDgYDVQQL
+DAdBbmRyb2lkMR4wHAYDVQQDDBVjb20uYW5kcm9pZC5jb25zY3J5cHQwggIiMA0G
+CSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCcfdThwuWhAk0362p7+s/8xL0Hi6Fe
+orQL30Kat8iK4ZPWM5HxOY1zmktBzjgKQ0qM4fuvHzrQJr2+SLl+l2miX4XTruAL
+w7MBS1EGzh0YC4cOBq9z8IsAW/lB6MDeAJ6TuflTk5BRun+bDB70IkWd0ylYSiTi
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+o3gHAepmwD7bt5tDFSuOW+uCeF7TzyqsE/CFvqWYUn+5rlOlcyFARAgCh1NZXqxq
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+UubVZYSfPiO4wTB9Jus63Y27KRdo4Bz4R4n/u0FjIi/cu0Zms07MTo60NPaGHNM/
+nMJSEDDjQ7ppoPXsamn0DID8HlZMivmcQgzokWswxw4b/i1O2fUotKEDf3wvJhUB
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+CLZS5dFnhkbVHi7PuvSwcFEXSr/fozcIMnCsQAds42cWqlWlDDVq90vYzOM+jQxS
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+yjpkBmKqDr89Xvyd9DYtZv8GbndTQLwyrPhlKLNOoly3jqjbxqAZGBpyxwVDU+Mo
+/NwkCheQeEYLrGXBgv9fLfyOLSZA7yihPTc0IQcm27DnpkZmJ/lWJ5jDG0VEkNp+
+60O5GYCs2/r3tO+YoiDSFNjsFgCoTcnOQwYhbBZC7YJLOKV0lYDjfsohE6tcCUuS
+H8Ln6Em9HhFAXZBVQU0N+OyC0bAuDTD72ClvbMQikyeWwhdvY3F0x5dDima0liqe
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+vrnN6KyRzj7OssDEHfXSZgSR0ZAVrAsgP3vc+lBpze9jtNbITDV1gOxUBX771hdU
+UIxewtyODcY=
+-----END CERTIFICATE-----