Release.sh changes for .whl tags to support breadth of Linux platforms

[digimaun]

Checklist

• I have read the [contribution guidelines] (https://github.com/Azure/azure-iot-sdk-python/blob/master/.github/CONTRIBUTING.md).
• I added or modified the existing tests to cover the change (we do not allow our test coverage to go down).
• If this is a modification that impacts the behavior of a public API
  • I edited the corresponding document in the devdoc folder and added or modified requirements.
• I submitted this PR against the correct branch:
  • This pull-request is submitted against the master branch.

Description of the problem

Existing platform architecture tags are not compliant with PEP513. Also there added specifier for ARMv7l like for Raspberry Pi 3.

Description of the solution

Small tweak to the Release.sh script with correct identifiers as specified by
https://www.python.org/dev/peps/pep-0513/ (for Linux)

and future state (for arm)
pypi/warehouse#2003

[msftclas]

@digimaun,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[zolvarga]

@digimaun
Thanks for contributing!