tools(bin): remove double quotes after git-secrets fix

see [Feature/fix scan files](awslabs/git-secrets#67)

Author: o-orand

templates/stub.openstack.example.yml

@@ -10,7 +10,7 @@ meta:
     haproxy: m1.small
     errand: m1.small
   stemcell:
-    name: bosh-openstack-kvm-ubuntu-trusty-go_agent
+    name: bosh-cloudstack-xen-ubuntu-trusty-go_agent
     version: latest
 
 releases: