Fixed bug in uamqp import logic

[ghost]

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Thank you for contributing to the IoT extension!

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General Guidelines

• If introducing new functionality or modified behavior, are they backed by unit and integration tests?
• In the same context as above are command names and their parameter definitions accurate? Do help docs have sufficient content?
• Have all unit and integration tests passed locally? i.e. pytest -s <project root>/azext_iot/tests
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[ghost]

Help is now working

Test passing (no need for uamqp):

Must install uamqp for these tests:

1. [Passing] test_iot_messaging_int.py

2. [Passing] test_iot_central_int.py
   

3. [Passing] test_iot_utility_unit.py