Make the Docker API connection timeout configurable

conf/glances.conf

@@ -351,6 +351,8 @@ port_default_gateway=True
 
 [docker]
 disable=False
+# Timeout for API calls (in seconds, default is 1)
+timeout=1
 # Only show specific containers (comma separeted list of container name or regular expression)
 # Comment this line to display all containers (default configuration)
 #show=telegraf

glances/plugins/glances_docker.py

@@ -137,7 +137,7 @@ class Plugin(GlancesPlugin):
     def connect(self):
         """Connect to the Docker server."""
         try:
-            ret = docker.from_env()
+            ret = docker.from_env(timeout=int(self.get_conf_value('timeout', '1')))
         except Exception as e:
             logger.error("docker plugin - Can not connect to Docker ({})".format(e))
             ret = None