RFR: all: username is one word

[Erik Helin]

Hi all,

please review this patch that is a refactoring to always use `username` instead of `userName`.

Thanks,
Erik

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Commit messages:
 - host: rename HostUser.userName -> HostUser.username

Changes: https://git.openjdk.java.net/skara/pull/888/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=888&range=00
  Stats: 127 lines in 39 files changed: 0 ins; 0 del; 127 mod
  Patch: https://git.openjdk.java.net/skara/pull/888.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/888/head:pull/888

PR: https://git.openjdk.java.net/skara/pull/888