Address review suggestions

Author: azinneera

cli/ballerina-cli/src/main/java/io/ballerina/cli/launcher/Main.java

@@ -87,7 +87,7 @@ public static void main(String... args) {
             Runtime.getRuntime().exit(e.getExitCode());
         } catch (Throwable e) {
             RuntimeUtils.logBadSad(e);
-            Runtime.getRuntime().exit(1);
+            Runtime.getRuntime().exit(1);;
         }
     }
 

tests/ballerina-test-utils/src/main/java/org/ballerinalang/test/context/BMainInstance.java

@@ -51,7 +51,7 @@ public class BMainInstance implements BMain {
     private String agentArgs = "";
     private BalServer balServer;
     public static final int TIMEOUT = 10000;
-    public  int exitCode = 0;
+    private  int exitCode = 0;
 
     private static class StreamGobbler extends Thread {
         private final InputStream inputStream;
@@ -682,6 +682,11 @@ public String runMainAndReadStdOut(String command, String[] args, Map<String, St
         }
     }
 
+    /**
+     * Returns the exit code of the last executed process.
+     *
+     * @return the exit code from the most recent call to {@link #runMainAndReadStdOut}
+     */
     public int getLastExitCode() {
         return exitCode;
     }