Fix unsafe yaml load and small refactoring

Signed-off-by: Adam.Dybbroe <a000680@c21856.ad.smhi.se>

pytroll_collectors/config.py

@@ -23,12 +23,11 @@
 """Handling the yaml configurations."""
 
 import yaml
-from yaml import UnsafeLoader
 
 
 def read_config(config_filepath):
     """Read and extract config information."""
     with open(config_filepath, 'r') as fp_:
-        config = yaml.load(fp_, Loader=UnsafeLoader)
+        config = yaml.safe_load(fp_)
 
     return config

pytroll_collectors/scisys.py

@@ -511,12 +511,8 @@ def receive_from_zmq(config_filename,
 
     config = read_config(config_filename)
 
-    excluded_platforms = config['excluded_satellites']
-    host = config['host']
-    port = config['port']
-
-    sock = GMCSubscriber(host, port)
-    msg_rec = MessageReceiver(host, excluded_platforms,
+    sock = GMCSubscriber(config['host'], config['port'])
+    msg_rec = MessageReceiver(config['host'], config['excluded_platforms'],
                               target_server, ftp_prefix)
 
     with Publish("receiver", port=publish_port,