Make java test independent from js tests

- The bucket cleaning might not work during js tests, and can
  be expected
- In such case, the java test should not enforce strict number
  of bucket, but use the existing number when starting...

Issue: CLDSRV-591

tests/functional/jaws/src/test/java/com/scality/JavaTest.java

@@ -49,14 +49,15 @@ public class JavaTest {
     }
 
     @Test public void testCreateBucket() throws Exception {
+        Object[] initialBuckets=getS3Client().listBuckets().toArray();
         getS3Client().createBucket(bucketName);
         Object[] buckets=getS3Client().listBuckets().toArray();
-        Assert.assertEquals(buckets.length,1);
+        Assert.assertEquals(buckets.length, initialBuckets.length + 1);
         Bucket bucket = (Bucket) buckets[0];
         Assert.assertEquals(bucketName, bucket.getName());
         getS3Client().deleteBucket(bucketName);
         Object[] bucketsAfter=getS3Client().listBuckets().toArray();
-        Assert.assertEquals(bucketsAfter.length, 0);
+        Assert.assertEquals(bucketsAfter.length, initialBuckets);
     }
 
 }