Change submit job response status in JobManagerRestApi

if (!jobSpec.validate()) {
 return new JsonResponse.Builder<String>(Response.Status.ACCEPTED)
 .success(true).result("Invalid params.").build();
}

try {
 Job job = JobManager.getInstance().submitJob(jobSpec);
 return new JsonResponse.Builder<Job>(Response.Status.ACCEPTED)
 .success(true).result(job).build();
} catch (UnsupportedJobTypeException e) {
 return new JsonResponse.Builder<String>(Response.Status.ACCEPTED)
 .success(true).result(e.getMessage()).build();
}