test: refactor test-cluster-send-deadlock to use arrow functions

[sagirk]

In test/parallel/test-cluster-send-deadlock.js, callbacks use
anonymous closure functions. It is safe to replace them with arrow
functions since these callbacks don't contain references to this,
super or arguments. This results in shorter functions.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[gireeshpunathil]

CI: https://ci.nodejs.org/job/node-test-pull-request/18754/

[sagirk]

@thefourtheye Build failure — common.mustCall seems to be the culprit here as well.

[sagirk]

Like @Trottpointed out, the build failure here too is caused because of wrapping an exit event handler within common.mustCall.

Update: had to remove the common.mustCall wrapper from both change-sites to get the build to pass.

[sagirk]

Build failed because the GitHub API rate limit was exceeded! 🙀

$ if [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then bash -x tools/lint-pr-commit-message.sh ${TRAVIS_PULL_REQUEST}; fi
+GH_API_URL=https://api.github.com
+PR_ID=24479
+'[' -z 24479 ']'
+'[' -z 24479 ']'
++curl -s https://api.github.com/repos/nodejs/node/pulls/24479/commits
+PR_COMMITS='{
"message": "API rate limit exceeded for 104.154.255.220. (But here'\''s the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)",
"documentation_url": "https://developer.github.com/v3/#rate-limiting"
}'
++node -p 'JSON.parse(process.argv[1])[0].url' '{
"message": "API rate limit exceeded for 104.154.255.220. (But here'\''s the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)",
"documentation_url": "https://developer.github.com/v3/#rate-limiting"
}'
+FIRST_COMMIT=
+echo 'Unable to determine the first commit for pull request 24479.'
Unable to determine the first commit for pull request 24479.
+exit 1
The command "if [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then bash -x tools/lint-pr-commit-message.sh ${TRAVIS_PULL_REQUEST}; fi" exited with 1.

[sagirk]

Rebased against master and force-pushed, triggering a new PR Build. Passed. PTAL.

[gireeshpunathil]

new CI: https://ci.nodejs.org/job/node-test-pull-request/18861/

[gireeshpunathil]

all good; just it needs to grow 72 hours old.

[gireeshpunathil]

landed as a67b22a , thanks!