Feature/knowledge load (#372)

* Switch off retry in Cassandra until we can differentiate retryable errors

* Fix config getvalues

* Loading knowledge cores works

trustgraph-base/trustgraph/api/knowledge.py

@@ -39,3 +39,29 @@ class Knowledge:
 
         self.request(request = input)
 
+    def load_kg_core(self, id, user="trustgraph", flow="0000",
+                     collection="default"):
+
+        # The input consists of system and prompt strings
+        input = {
+            "operation": "load-kg-core",
+            "user": user,
+            "id": id,
+            "flow": flow,
+            "collection": collection,
+        }
+
+        self.request(request = input)
+
+    def unload_kg_core(self, id, user="trustgraph", flow="0000"):
+
+        # The input consists of system and prompt strings
+        input = {
+            "operation": "unload-kg-core",
+            "user": user,
+            "id": id,
+            "flow": flow,
+        }
+
+        self.request(request = input)
+