RFR: Use inheritIO for git command to get output

[Erik Helin]

Hi all,

this small patch uses a `ProcessBuilder` for `git push --set-upstream` instead of the `Repository.push` function. This is done in order to have to the `git` process inherit the file descriptors from the `java` process, so that the output from `git` will be shown in the terminal.

Thanks,
Erik

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Commits:
 - 1d164cfd: Use inheritIO for git command to get output

Changes: https://git.openjdk.java.net/skara/pull/199/files
 Webrev: https://webrevs.openjdk.java.net/skara/199/webrev.00
  Stats: 9 lines in 1 file changed: 7 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/199.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/199/head:pull/199

PR: https://git.openjdk.java.net/skara/pull/199