Island: Add collection name properties to config and mode models

Collection name properties are useful for queries related to these specific collections

monkey/monkey_island/cc/models/config.py

@@ -2,6 +2,9 @@ from mongoengine import BooleanField, EmbeddedDocument
 
 
 class Config(EmbeddedDocument):
+
+    COLLECTION_NAME = "config"
+
     """
     No need to define this schema here. It will change often and is already is defined in
     monkey_island.cc.services.config_schema.

monkey/monkey_island/cc/models/island_mode_model.py

@@ -2,4 +2,6 @@ from mongoengine import Document, StringField
 
 
 class IslandMode(Document):
+    COLLECTION_NAME = "island_mode"
+
     mode = StringField()