Functions have access to secrets/configmaps specified by the user (#399)

This commit solves part of the issue #52 , functions are able to access secrets/configmaps specified by the user. For now, CLI only accept one secret/configmap. For advanced users, it will be able to use YAML to declare multiple secrets/configmaps in later changes.

test/tests/test_secret_cfgmap/empty.py

@@ -0,0 +1,7 @@
+import os
+def main():
+	cfgmap_path = "/configs/"
+	secret_path = "/secrets/"
+	if os.listdir(cfgmap_path) or os.listdir(secret_path):
+		return "no", 400
+	return "yes", 200