RFR: 913: Skara should honor .gitconfig and /etc/gitconfig [v2]

[Magnus Ihse Bursie]

> In SKARA-868, the fix to ignore .gitconfig and /etc/gitconfig was applied universally, which is causing trouble for users. The intention from the filer was to just disable this when running the Skara tests. I still think we should have a way to ignore gitconfig when running tests, but we need to keep honoring the git configuration at runtime.

Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:

  Updates as requested by reviewer.

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1049/files
  - new: https://git.openjdk.java.net/skara/pull/1049/files/fbfe160a..06162f82

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1049&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1049&range=00-01

  Stats: 7 lines in 3 files changed: 0 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/skara/pull/1049.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1049/head:pull/1049

PR: https://git.openjdk.java.net/skara/pull/1049