CORD-1972: Add blueprint type to config file for being able to encode a
child service graph

Change-Id: I194ced7db631b2b379aaf192301c2bbce1f90a62
(cherry picked from commit 78085264a1f6a5b5db82ff44b582259bd08d0b8e)
diff --git a/lib/xos-config/xosconfig/default.py b/lib/xos-config/xosconfig/default.py
index 61829ba..f6469aa 100644
--- a/lib/xos-config/xosconfig/default.py
+++ b/lib/xos-config/xosconfig/default.py
@@ -23,6 +23,7 @@
     # So for instance, you can add new handlers. Note that all handlers will
     # receive logs simultaneously.
 
+    'blueprints': {},
     'logging': {
         'version': 1,
         'handlers': {