Use Flask-APScheduler. Move docker swarm logic to scheduler.

app/services/views.py

@@ -3,9 +3,7 @@ from . import services
 from flask_login import current_user, login_required
 from .forms import NewOCRJobForm, NewNLPJobForm
 from ..models import Job
-from ..import swarm
 from .. import db
-from threading import Thread
 import json
 import os