Merge branch '93_follow_raise_on_error_property' into 'master'

Handle docker exception following the raise on error property for the new environment discovery

Closes #93

See merge request !108

beat/core/dock.py

@@ -416,11 +416,31 @@ class Host(object):
 
         client = docker.from_env()
 
-        databases = client.images.list(filters={"label": ["beat.env.type=database"]})
-        db_environments = _process_image_list(databases)
+        try:
+            databases = client.images.list(
+                filters={"label": ["beat.env.type=database"]}
+            )
+        except Exception as e:
+            if self.raise_on_errors:
+                raise
+            else:
+                logger.error("Docker error: {}".format(e))
+                return {}, {}
+        else:
+            db_environments = _process_image_list(databases)
 
-        executors = client.images.list(filters={"label": ["beat.env.type=execution"]})
-        environments = _process_image_list(executors)
+        try:
+            executors = client.images.list(
+                filters={"label": ["beat.env.type=execution"]}
+            )
+        except Exception as e:
+            if self.raise_on_errors:
+                raise
+            else:
+                logger.error("Docker error: {}".format(e))
+                return {}, {}
+        else:
+            environments = _process_image_list(executors)
 
         logger.debug(
             "Found %d environments and %d database environments",