Improve logging on server

Log to file and std. Configured in server config file.

dsst/dsst_server/config.py

@@ -1,5 +1,6 @@
 # This config will be copied on first launch.
 # Edit the the copied file at '~/.config/dsst/server.json' before launching the server
+# IMPORTANT: For a client to access the server you have to set authentication tokens in the server config
 DEFAULT_CONFIG = {
     'database': {
         'db_name': 'dsst',
@@ -7,12 +8,38 @@ DEFAULT_CONFIG = {
         'password': 'dsst'
     },
     'server': {
-        'host': 'localhost',
         'port': 55225,
         'buffer_size': 1024
     },
     'tokens': {
-        '<read_write_token_here>': 'rw',
-        '<read_only_token_here>': 'r'
-    }
+        'readonly': [],
+        'readwrite': []
+    },
+    'logging': dict(
+        version=1,
+        disable_existing_loggers=False,
+        formatters={
+            'file': {'format': '[%(levelname)s] %(asctime)s - %(message)s',
+                     'datefmt': '%Y-%m-%d %H:%M:%S'},
+            'std': {'format': '[%(levelname)s] %(message)s'}
+        },
+        handlers={
+            'console': {
+                'class': 'logging.StreamHandler',
+                'formatter': 'std',
+                'level': 'INFO'
+            },
+            'logfile': {
+                'class': 'logging.handlers.RotatingFileHandler',
+                'maxBytes': 3145728,
+                'backupCount': 1,
+                'formatter': 'file',
+                'level': 'INFO'
+            }
+
+        },
+        root={
+            'handlers': ['console', 'logfile'],
+            'level': 'INFO'
+        })
 }