Rename roles.yml to roles.yaml

All our other YAML files end with .yaml and also:

  http://www.yaml.org/faq.html

Change-Id: I2ecf2e715f704d92861d34db1479fdd29ff816d8

run_all.sh

@@ -22,7 +22,7 @@ set -e
 cd /opt/system-config/production
 git fetch -a && git reset -q --hard @{u}
 ./install_modules.sh
-ansible-galaxy install -r roles.yml
+ansible-galaxy install -r roles.yaml
 
 # One must touch manifests/site.pp to trick puppet into re-loading modules
 # some times