RFR: host: add method Host.hostname

[Erik Helin]

Hi all,

please review this patch that adds the method `Host.hostname`.

Thanks,
Erik

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Commit messages:
 - host: add method Host.hostname

Changes: https://git.openjdk.java.net/skara/pull/922/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=922&range=00
  Stats: 31 lines in 7 files changed: 31 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/922.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/922/head:pull/922

PR: https://git.openjdk.java.net/skara/pull/922