[dev_setup] Group should be an integer

Newer versions of Chef varies its behavior based on the type of GID.
This patch (kudos to Doug MacEachern) makes both new and old versions
happy.

Change-Id: Ib7f05899d2e2e04ca34385512efcad8509d9cc5d

dev_setup/lib/chefsolo_launch.rb

@@ -40,7 +40,7 @@ spec = YAML.load_file(deployment_spec)
 spec["deployment"] ||= {}
 spec["deployment"]["name"] ||= DEPLOYMENT_DEFAULT_NAME
 spec["deployment"]["user"] ||= ENV["USER"]
-spec["deployment"]["group"] ||= `id -g`.strip
+spec["deployment"]["group"] ||= `id -g`.strip.to_i
 spec["deployment"]["domain"] ||= cloudfoundry_domain
 spec["cloudfoundry"] ||= {}
 spec["cloudfoundry"]["home"] ||= cloudfoundry_home