Fix Syntax error

```
The r10k application failed to run, use -v for full error details: /opt/puppet/libexec/mcollective/mcollective/agent/r10k.ddl:64: syntax error, unexpected tASSOC, expecting keyword_end
             :display_as => "Specific environment"
                           ^

/opt/puppet/libexec/mcollective/mcollective/agent/r10k.ddl:64: syntax error, unexpected tASSOC, expecting keyword_end
             :display_as => "Specific environment"
                           ^ (SyntaxError)
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/base.rb:80:in `instance_eval'  <----
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/base.rb:80:in `loadddlfile'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/base.rb:31:in `initialize'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl/agentddl.rb:43:in `initialize'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl.rb:85:in `new'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl.rb:85:in `rescue in load_and_cache'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl.rb:76:in `load_and_cache'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/ddl.rb:66:in `new'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/rpc/client.rb:90:in `initialize'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/rpc.rb:73:in `new'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/rpc.rb:73:in `rpcclient'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/application.rb:354:in `rpcclient'
    from /opt/puppet/libexec/mcollective/mcollective/application/r10k.rb:19:in `main'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/application.rb:285:in `run'
    from /opt/puppet/lib/ruby/site_ruby/1.9.1/mcollective/applications.rb:23:in `run'
    from /opt/puppet/bin/mco:20:in `<main>'
```