[Integrated] RFR: git-pr: use multi-command argument parser

[Erik Helin]

Changeset: 529eedf9
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-02-20 10:19:19 +0000
URL:       https://git.openjdk.java.net/skara/commit/529eedf9

git-pr: use multi-command argument parser

Reviewed-by: rwestberg

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