Integrated: forge: refactor HostUser constructor to static methods

[Erik Helin]

Hi all,

please review this patch that refactors `HostUser` to get have private constructors and instead use public static
creator functions. This is in preparation for a refactoring to using a "builder" for the `HostUser` class.

Thanks,
Erik

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Commit messages:
 - forge: refactor HostUser constructor to static method

Changes: https://git.openjdk.java.net/skara/pull/889/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=889&range=00
  Stats: 151 lines in 19 files changed: 9 ins; 0 del; 142 mod
  Patch: https://git.openjdk.java.net/skara/pull/889.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/889/head:pull/889

PR: https://git.openjdk.java.net/skara/pull/889