[ServiceBus] Fix TTL on messages

[jyggen]

Using seconds on timedelta to set TTL leads to unexpected behaviour with, for example, timedelta(days=1):

azure.servicebus.exceptions.ServiceBusError: Argument TimeToLIve must be a positive timeout value. The provided value was 00:00:00.
Parameter name: TimeToLIve
Actual value was 00:00:00

Instead of seconds, total_seconds() should be used:

>>> timedelta(days=1).seconds
0
>>> timedelta(days=1).total_seconds()
86400.0

[ghost]

Thank you for your contribution jyggen! We will review the pull request and get back to you soon.

[ghost]

All CLA requirements met.

[yunhaoling]

nice catch! thanks @jyggen for the PR!
it looks good to me, will merge it after passing the tests.

[yunhaoling]

/azp run python - servicebus - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[yunhaoling]

test passed, appreciate your contribution, your fix will be included in our next release🎉

[ghost]

Hello @yunhaoling!

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