[Integrated] RFR: 92: GitRepository::currentBranch fails when on a detached HEAD

[Erik Helin]

Changeset: 0fb118f0
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-12-02 09:01:14 +0000
URL:       https://git.openjdk.java.net/skara/commit/0fb118f0

92: GitRepository::currentBranch fails when on a detached HEAD

Reviewed-by: rwestberg

! cli/src/main/java/org/openjdk/skara/cli/GitPr.java
! cli/src/main/java/org/openjdk/skara/cli/GitPublish.java
! cli/src/main/java/org/openjdk/skara/cli/GitWebrev.java
! jcheck/src/test/java/org/openjdk/skara/jcheck/TestRepository.java
! vcs/src/main/java/org/openjdk/skara/vcs/ReadOnlyRepository.java
! vcs/src/main/java/org/openjdk/skara/vcs/git/GitRepository.java
! vcs/src/main/java/org/openjdk/skara/vcs/hg/HgRepository.java
! vcs/src/test/java/org/openjdk/skara/vcs/RepositoryTests.java