BugFix: remove an virtualenv option from CiaB Makefile

Change-Id: I7b784dca1f23a2338608ebd6f6101ce0f47e9ed1
diff --git a/comac-in-a-box/Makefile b/comac-in-a-box/Makefile
index e792cd4..b8d2052 100644
--- a/comac-in-a-box/Makefile
+++ b/comac-in-a-box/Makefile
@@ -74,7 +74,7 @@
 
 $(VENV)/bin/activate: | $(M)/setup
 	sudo pip install virtualenv
-	virtualenv $(VENV) --no-site-packages
+	virtualenv $(VENV)
 
 $(M)/kubespray-requirements: $(BUILD)/kubespray | $(VENV)/bin/activate
 	source "$(VENV)/bin/activate" && \