Better truetime init

app/src/main/java/ru/ytkab0bp/slicebeam/boot/AppBoot.java

@@ -40,6 +40,12 @@ public class AppBoot {
                 }
             }
             Log.d("boot", "Boot in " + (System.currentTimeMillis() - start) + "ms");
+            executor.shutdown();
+            executor = null;
+            pendingMain = null;
+            pendingTasks = null;
+            completed = null;
+            latch = null;
         } catch (InterruptedException e) {
             throw new RuntimeException(e);
         }

app/src/main/java/ru/ytkab0bp/slicebeam/boot/TrueTimeTask.java

@@ -5,12 +5,11 @@ import com.instacart.library.truetime.TrueTime;
 import java.io.IOException;
 
 public class TrueTimeTask extends BootTask {
-    /** @noinspection BusyWait*/
     public TrueTimeTask() {
         super(() -> {
-            while (true) {
+            for (int i = 0; i < 2; i++) {
                 try {
-                    TrueTime.build().withNtpHost("0.ru.pool.ntp.org").initialize();
+                    TrueTime.build().withNtpHost("1.ru.pool.ntp.org").initialize();
                     break;
                 } catch (IOException ignore) {
                     try {