Fix Blocker/Critical sonar issues in appc module
https://sonar.onap.org/component_issues?id=org.openecomp.appc%3Aappc#resolved=false|severities=BLOCKER|fileUuids=AV36PknS89V-MRZU58_g
Issue-Id: APPC-186
Change-Id: I50868e7e76f03a724d97889432f2dce53552b36f
Signed-off-by: shashikanth.vh <shashikanth.vh@huawei.com>
     {
         StringBuffer strBuff = new StringBuffer();
         String line;
-        try(BufferedReader in = new BufferedReader(new FileReader(fileName)))
+        try (BufferedReader in = new BufferedReader(new FileReader(fileName)))
         {
             while ((line = in.readLine()) != null)
             {