fix exchange link child-spec release handling module

[Ayanda-D]

Proposed Changes

The rabbit_federation_exchange_link process is currently using the wrong release handling module. In fact, its using a completely non-existent rabbit_federation_link module.

In case of an OTP release upgrade, changes in this link process will not be loaded appropriately in the ERTS code server (& will actually fail due to a non-existent rabbit_federation_link).

This change corrects this, specifies the rabbit_federation_exchange_link callback module for release handling.

Types of Changes

• [x] Bugfix (non-breaking change which fixes issue #NNNN)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation (correction or otherwise)
• [ ] Cosmetics (whitespace, appearance)

Checklist

• [x] I have read the CONTRIBUTING.md document
• [x] I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
• [x] All tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in related repositories

[pivotal-issuemaster]

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[pivotal-issuemaster]

@Ayanda-D Thank you for signing the Contributor License Agreement!

[lukebakken]

Thanks!