RFR: 2191 Handle multiple available skara.gitconfig files

[Ludvig Janiuk]

This adds "tail -1" to the bootstrap mechanism, to handle the case if we find more than one skara.gitconfig file. The alternative is to execute a malformed shell invocation.

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Commit messages:
 - 2191 Handle multiple available skara.gitconfig files

Changes: https://git.openjdk.org/skara/pull/1618/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1618&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2191
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1618.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1618/head:pull/1618

PR: https://git.openjdk.org/skara/pull/1618