Rename check_no_unwrap.sh to check_no_panic.sh

[zeusintuivo]

• rename etc/ci/check_no_unwrap.sh to etc/ci/check_no_panic.sh
• Replaced check_no_unwrap for check_no_panic
• Rebased against Origin Mozilla/Master
• Ran the build and tidy below without errors

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• ./mach build -d does not report any errors
• ./mach test-tidy does not report any errors
• These changes fix #10930 (github issue number if applicable).

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This change is

[highfive]

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @metajack (or someone else) soon.

[highfive]

Heads up! This PR modifies the following files:

• @aneeshusa: etc/ci/check_no_panic.sh, etc/ci/check_no_unwrap.sh, etc/ci/buildbot_steps.yml

[KiChjang]

This is a duplicate of #10942. If the status of #10942 wasn't clear, it is being blocked from merging into master because of servo/saltfs#316.

[zeusintuivo]

Except this PR is passing.

[jdm]

Yes, because we control the travis CI environment from .travis.yml. The steps are different for our non-travis build machines.

[jdm]

I'm going to close this in favour of #10942. Thanks for trying to solve it, however!