device_management.py supports application access keys

[norbert-david]

Summary of changes

The Mbed CLI tool fails to initialize with application access keys. This PR changes the device_management.py so that it works with the new access keys as the legacy API key feature is now deprecated in Pelion Device Management.

Impact of changes

The init script still works with legacy API keys.

Migration actions required

Documentation

None

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@norbert-david, thank you for your changes.
@ARMmbed/mbed-os-tools @ARMmbed/mbed-os-maintainers please review.

[teetak01]

Verified to work with both API-keys (ak1_xx) and Application keys (ak2_xx).

[0xc0170]

CI started

[mbed-ci]

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