[PATCH mptcp-next 0/9] Refactor mptcp_join.sh

[Matthieu Baerts <matthieu.baerts@tessares.net>]

I started this series to be able to launch a specific test without
having to modify the script to comment tests from the subgroup I didn't
want to validate when trying to reproduce a specific issue in a loop.
That's what we can find in patch 3/9.

While at it, I:
- fixed one issue with the options (patch 1/9)
- stop if an option doesn't exist (patch 2/9)
- removed unused vars (patch 4/9)
- delay some actions to the first test not to do them if no test is
  launched (patches 5-6/9)

But after having seen all modified lines, why stopping there? So I:
- clarify local vs global variables to avoid Bash's classical pitfall
  (patch 7/9)
- fixed all issues reported by ShellCheck except one (patch 8-9/9)

These last 3 patches (+ patch 3/9) will create a lot of conflicts. If
we are OK with them, probably best not to wait to long before applying
them to avoid big rebases.

For the patches that are already in review, I can fix the conflicts when
applying them.

Matthieu Baerts (9):
  selftests: mptcp: join: allow running -cCi
  selftests: mptcp: join: exit after printing usage
  selftests: mptcp: join: option to execute specific tests
  selftests: mptcp: join: remove unused vars
  selftests: mptcp: join: create tmp files only if needed
  selftests: mptcp: join: check for tools only if needed
  selftests: mptcp: join: clarify local/global vars
  selftests: mptcp: join: avoid backquotes
  selftests: mptcp: join: make it shellcheck compliant

 .../testing/selftests/net/mptcp/mptcp_join.sh | 2342 +++++++++--------
 1 file changed, 1257 insertions(+), 1085 deletions(-)

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2.34.1