[PATCH v3 0/3] Teach submodule set-branch subcommand

I rebased the changes onto the latest 'next' because if this branch gets merged into 'next', there'll be merge conflicts from 'dl/complete-submodule-absorbgitdirs'.

Currently, there is no way to set the branch of a submodule without manually manipulating the .gitmodules file. This patchset introduces a porcelain command that enables this.

Changes since v1:
	* Fixed incorrect usage of OPT_CMDMODE

Changes since v2:
	* Corrected missing argument for -b/--branch in git-submodule.txt
	* Rebased onto latest next

Denton Liu (3):
  git-submodule.txt: "--branch <branch>" option defaults to 'master'
  submodule--helper: teach config subcommand --unset
  submodule: teach set-branch subcommand

 Documentation/git-submodule.txt        | 14 +++-
 builtin/submodule--helper.c            | 18 +++--
 contrib/completion/git-completion.bash |  5 +-
 git-submodule.sh                       | 75 +++++++++++++++++++--
 t/t7411-submodule-config.sh            |  9 +++
 t/t7419-submodule-set-branch.sh        | 93 ++++++++++++++++++++++++++
 6 files changed, 200 insertions(+), 14 deletions(-)
 create mode 100755 t/t7419-submodule-set-branch.sh