Add logging to controller

src/controller/handlers/solution_check_handler.py

@@ -1,11 +1,15 @@
 from tornado.web import RequestHandler
 
+from tfw.config.logs import logging
+log = logging.getLogger(__name__)
 
 class SolutionCheckHandler(RequestHandler):
     def initialize(self, solvable_connector):
         self.solvable_connector = solvable_connector
 
     def get(self):
+        log.debug('Sending request to solvable')
         self.solvable_connector.send('solution_check', {})
         resp_key, resp_data = self.solvable_connector.recv()
+        log.debug('Received answer from solvable')
         self.write(resp_data)