Fix violations of Sonar rule 2142 (#488)

Author: khesoem

src/test/java/com/networknt/schema/BaseSuiteJsonSchemaTest.java

@@ -60,6 +60,7 @@ public static void tearDown() throws Exception {
             try {
                 Thread.sleep(100);
             } catch (InterruptedException ignored) {
+				Thread.currentThread().interrupt();
 
             }
             server.stop();

src/test/java/com/networknt/schema/Issue425Test.java

@@ -46,6 +46,7 @@ public static void tearDown() throws Exception {
             try {
                 Thread.sleep(100);
             } catch (InterruptedException ignored) {
+                Thread.currentThread().interrupt();
 
             }
             server.stop();

src/test/java/com/networknt/schema/Issue428Test.java

@@ -46,6 +46,7 @@ public static void tearDown() throws Exception {
             try {
                 Thread.sleep(100);
             } catch (InterruptedException ignored) {
+                Thread.currentThread().interrupt();
 
             }
             server.stop();

src/test/java/com/networknt/schema/OpenAPI30JsonSchemaTest.java

@@ -46,6 +46,7 @@ public static void tearDown() throws Exception {
             try {
                 Thread.sleep(100);
             } catch (InterruptedException ignored) {
+                Thread.currentThread().interrupt();
 
             }
             server.stop();