Fix passing hash

```
        "/opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/agentddl.rb:166:in `block in validate_rpc_request'",
        "/opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/agentddl.rb:159:in `each'",
        "/opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/agentddl.rb:159:in `validate_rpc_request'",
        "/opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/rpc/client.rb:220:in `method_missing'",
        "/usr/local/bin/webhook:89:in `mco'",
        "/usr/local/bin/webhook:73:in `deploy'",
        "/usr/local/bin/webhook:62:in `block in <class:Server>'",
```