Adding ability to set DEFAULT/host

Change-Id: Ia7c9a3fc40d014ed4bbf1119e1ce417a729baa0c
diff --git a/README.rst b/README.rst
index 213a8b1..91583de 100644
--- a/README.rst
+++ b/README.rst
@@ -208,6 +208,7 @@
         qemu:
           max_files: 4096
           max_processes: 4096
+        host: node-12.domain.tld
 
 Nova services on compute node with OpenContrail