tweaks to recovery retry

[vikinghawk]

Proposed Changes

Changed the helper method to return the builder instead of the built RetryHandler so it is easy to add your own backoff impl and chagne retry attempts. Also a tweak to the logging so it logs each retry loop and how many attempts are remaining.

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• 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

Put an x in the boxes that apply. You can also fill these out after creating
the PR. If you're unsure about any of them, don't hesitate to ask on the
mailing list. We're here to help! This is simply a reminder of what we are
going to look for before merging your code.

• I have read the CONTRIBUTING.md document
• I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
• 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

Further Comments

If this is a relatively large or complex change, kick off the discussion by
explaining why you chose the solution you did and what alternatives you
considered, etc.

[vikinghawk]

assuming we want the last exception thrown here rather than the 1st since the others should have been logged already? If not i can change it back.

[acogoluegnes]

Makes sense.

[acogoluegnes]

Makes sense.

[acogoluegnes]

Thanks! Changes are minor but I'll release a RC for both 5.x and 4.x today.