more consistent interrupt state restoration

Author: inponomarev

src/main/java/org/apache/commons/lang3/concurrent/BackgroundInitializer.java

@@ -345,7 +345,11 @@ public synchronized boolean isInitialized() {
         try {
             future.get();
             return true;
-        } catch (CancellationException | ExecutionException | InterruptedException e) {
+        } catch (CancellationException | ExecutionException e) {
+            return false;
+        } catch (InterruptedException e) {
+            // reset interrupted state
+            Thread.currentThread().interrupt();
             return false;
         }
     }