Allow scalar to succeed despite maintenance failures

At $DAYJOB we received a report of issues with scalar clone and scalar register in a protected environment. Specifically, they couldn't run crontab or systemctl, which causes git maintenance start to fail. That failure was percolating through scalar clone and scalar register, even though the rest of their repository was properly set up.

Convert these hard failures into soft warnings.

This change could probably be done in a single commit, but I wanted to demonstrate the existing behavior before changing it. The first patch was also a related necessary step that will be helpful for future scalar tests.

Thanks,

* Stolee

Derrick Stolee (3):
t: allow 'scalar' in test_must_fail
t921*: test scalar behavior starting maintenance
scalar: only warn when background maintenance fails

 scalar.c                | 2 +-
 t/t9210-scalar.sh       | 7 +++++++
 t/t9211-scalar-clone.sh | 6 ++++++
 t/test-lib-functions.sh | 2 +-
 4 files changed, 15 insertions(+), 2 deletions(-)

base-commit: 5cc9858f1b470844dea5c5d3e936af183fdf2c68
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1473%2Fderrickstolee%2Fscalar-register-warn-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1473/derrickstolee/scalar-register-warn-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1473

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