Increase test timeout for slow devices

OEMs have found some configurations of Android devices that cannot
meet the timeout. This change doubles the timeout from 30 to 60
seconds.

The Android bug reference is 27273056.

okhttp-tests/src/test/java/okhttp3/internal/DiskLruCacheTest.java

@@ -50,7 +50,7 @@
 
 public final class DiskLruCacheTest {
   @Rule public final TemporaryFolder tempDir = new TemporaryFolder();
-  @Rule public final Timeout timeout = new Timeout(30 * 1000);
+  @Rule public final Timeout timeout = new Timeout(60 * 1000);
 
   private final FaultyFileSystem fileSystem = new FaultyFileSystem(FileSystem.SYSTEM);
   private final int appVersion = 100;