configuration format improvement

[yssk22r]

I found cloudfoundry/vcap components use 'port'/'user'/'password' for status server configuration,whereas cloudfoundry/vcap-services use 'port'/'username'/'password'.

It does not matter which to use 'user' or 'username' but it would be better to use the same format to reduce configuration errors.

I think 'username' would be better but all vcap components already use 'user' as the name, which I took in

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[yssk22r]

I also found :username is not used in VCAP::Component#register, so that this is a bug fix.