[Integrated] RFR: git-sync: use ref names instead of hashes

[Erik Helin]

Changeset: 9958c7e4
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-02-07 07:43:35 +0000
URL:       https://git.openjdk.java.net/skara/commit/9958c7e4

git-sync: use ref names instead of hashes

Reviewed-by: rwestberg

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