Remove leftover homedir clouds.yaml files

We don't write files here anymore, but it's higher in the precedence
order than the /etc/openstack/clouds.yaml file we do write. Some
developers who have long-lived devstacks who update infrequently have
been bitten by the leftover file.

Change-Id: I8af6bd465f74099c560dddba6b5221dd79cbc965
diff --git a/functions-common b/functions-common
index 47276f0..12c925b 100644
--- a/functions-common
+++ b/functions-common
@@ -106,6 +106,9 @@
         --os-username admin \
         --os-password $ADMIN_PASSWORD \
         --os-project-name admin
+
+    # CLean up any old clouds.yaml files we had laying around
+    rm -f ~$STACK_USER/.config/openstack/clouds.yaml
 }
 
 # trueorfalse <True|False> <VAR>