Check tests shell scripts with shellcheck
- Fix a couple of shellcheck warnings.
- Add shellcheck to `make check' for all unit tests.
- Install shellcheck in the CI.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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- Fix a couple of shellcheck warnings.
- Add shellcheck to `make check' for all unit tests.
- Install shellcheck in the CI.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>