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>

Bug: 113373927
Test: jarsigner -verify -verbose -certs out/target/product/blueline/system/apex/com.android.runtime.{release|debug}.apex shows
...
X.509, CN=com.android.runtime.{release|debug}, OU=Android, O=Android, L=Mountain View, ST=California, C=US

Change-Id: Ica1643c5c66ef19a362303f6ac4156435a331d21
diff --git a/build/apex/Android.bp b/build/apex/Android.bp
index 735755f..006555b 100644
--- a/build/apex/Android.bp
+++ b/build/apex/Android.bp
@@ -126,6 +126,16 @@
     private_key: "com.android.runtime.pem",
 }
 
+android_app_certificate {
+    name: "com.android.runtime.debug.certificate",
+    certificate: "com.android.runtime.debug",
+}
+
+android_app_certificate {
+    name: "com.android.runtime.release.certificate",
+    certificate: "com.android.runtime.release",
+}
+
 prebuilt_etc {
     name: "com.android.runtime.ld.config.txt",
     src: "ld.config.txt",
@@ -164,6 +174,7 @@
     prebuilts: art_runtime_data_file_prebuilts
         + ["com.android.runtime.ld.config.txt"],
     key: "com.android.runtime.key",
+    certificate: ":com.android.runtime.release.certificate",
 }
 
 // "Debug" version of the Runtime APEX module (containing both release and
@@ -198,6 +209,7 @@
     prebuilts: art_runtime_data_file_prebuilts
         + ["com.android.runtime.ld.config.txt"],
     key: "com.android.runtime.key",
+    certificate: ":com.android.runtime.debug.certificate",
 }
 
 // TODO: Do this better. art_apex will disable host builds when
diff --git a/build/apex/com.android.runtime.debug.pk8 b/build/apex/com.android.runtime.debug.pk8
new file mode 100644
index 0000000..5eec5d8
--- /dev/null
+++ b/build/apex/com.android.runtime.debug.pk8
Binary files differ
diff --git a/build/apex/com.android.runtime.debug.x509.pem b/build/apex/com.android.runtime.debug.x509.pem
new file mode 100644
index 0000000..73402f5
--- /dev/null
+++ b/build/apex/com.android.runtime.debug.x509.pem
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIF0DCCA7igAwIBAgIJALbaJLNNAiRDMA0GCSqGSIb3DQEBCwUAMHwxCzAJBgNV
+BAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1Nb3VudGFpbiBW
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+Ibx3Nw==
+-----END CERTIFICATE-----
diff --git a/build/apex/com.android.runtime.release.pk8 b/build/apex/com.android.runtime.release.pk8
new file mode 100644
index 0000000..c63efb8
--- /dev/null
+++ b/build/apex/com.android.runtime.release.pk8
Binary files differ
diff --git a/build/apex/com.android.runtime.release.x509.pem b/build/apex/com.android.runtime.release.x509.pem
new file mode 100644
index 0000000..4a7607a
--- /dev/null
+++ b/build/apex/com.android.runtime.release.x509.pem
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIF0DCCA7igAwIBAgIJAMtsu/wrkZurMA0GCSqGSIb3DQEBCwUAMHwxCzAJBgNV
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+-----END CERTIFICATE-----