[Integrated] RFR: git-sync: use upstream remote and support fork remote

[Erik Helin]

Changeset: 8d3e18d3
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-12-09 14:49:32 +0000
URL:       https://git.openjdk.java.net/skara/commit/8d3e18d3

git-sync: use upstream remote and support fork remote

Reviewed-by: rwestberg

! cli/src/main/java/org/openjdk/skara/cli/GitSync.java