Test APK section zip methods with real APK files

This CL also renames some variables to make them consistent with
the apk structure spec.

Test: atest libapkverify.test
Change-Id: Iba2a060916a59f295e702d4ef5a3618076acf4ed
diff --git a/libs/apkverify/Android.bp b/libs/apkverify/Android.bp
index ab9265d..50d7a60 100644
--- a/libs/apkverify/Android.bp
+++ b/libs/apkverify/Android.bp
@@ -30,6 +30,7 @@
     name: "libapkverify.test",
     defaults: ["libapkverify.defaults"],
     test_suites: ["general-tests"],
+    data: ["tests/data/*"],
 }
 
 rust_test {