Don't print status output with submodule.<name>.ignore=all

There are configuration options for each submodule that specify under what circumstances git status should display output for that submodule. Unfortunately, these settings were not being respected, and as such the tests were marked TODO.

This patch series consists of two patches: the first is a fix for a confusing variable name, and the latter actually makes git status not output the submodule information. The tests have been updated accordingly.

 git-submodule.sh  | 10 ++++++----
 t/t7508-status.sh |  4 ++--
 2 files changed, 8 insertions(+), 6 deletions(-)