Relax namespace restriction on system server classloader

Add java.library.path to list of permitted paths
for system server classloader. This allows libraries
loaded in system server classloader namespace to
dlopen libraries under /system/lib/somedir

Test: m
Bug: http://b/31652397
Change-Id: Ief70aaa81cde4983c8de1e07b4ef23e1fadf35a0

core/java/com/android/internal/os/ZygoteInit.java

@@ -476,11 +476,11 @@ public class ZygoteInit {
      */
     private static PathClassLoader createSystemServerClassLoader(String systemServerClasspath,
                                                                  int targetSdkVersion) {
-      String librarySearchPath = System.getProperty("java.library.path");
+      String libraryPath = System.getProperty("java.library.path");
 
       return PathClassLoaderFactory.createClassLoader(systemServerClasspath,
-                                                      librarySearchPath,
-                                                      null /* libraryPermittedPath */,
+                                                      libraryPath,
+                                                      libraryPath,
                                                       ClassLoader.getSystemClassLoader(),
                                                       targetSdkVersion,
                                                       true /* isNamespaceShared */);