Enable package verification

Turn on package verification, if a verifier exists. Play app is now a verifier.

Bug: 7064853
Change-Id: I11f6b108c507ea6236038b1415eb9064ca4c3c6d

Author: rich cannings

services/java/com/android/server/pm/PackageManagerService.java

@@ -208,8 +208,7 @@ public class PackageManagerService extends IPackageManager.Stub {
     /**
      * Whether verification is enabled by default.
      */
-    // STOPSHIP: change this to true
-    private static final boolean DEFAULT_VERIFY_ENABLE = false;
+    private static final boolean DEFAULT_VERIFY_ENABLE = true;
 
     /**
      * The default maximum time to wait for the verification agent to return in