Sign MicrdroidTestApp using APK sig scheme V4

... and copy the idsig file to the device.

Note that the copied idsig file is not used currently, because
mk_payload can't handle the file yet.

Bug: N/A
Test: atest MicrodroidHostTestCases
Change-Id: I7db582ac7933decfe00395ebe83e146ed61618a6
diff --git a/tests/hostside/Android.bp b/tests/hostside/Android.bp
index 0414030..8edd65d 100644
--- a/tests/hostside/Android.bp
+++ b/tests/hostside/Android.bp
@@ -6,6 +6,9 @@
     name: "MicrodroidHostTestCases",
     srcs: ["java/**/*.java"],
     test_suites: ["device-tests"],
-    libs: ["tradefed"],
-    data: [":MicrodroidTestApp"],
+    libs: [
+        "tradefed",
+        "compatibility-tradefed",
+    ],
+    data: [":MicrodroidTestApp.signed"],
 }