[201911][Python] Migrate applications/scripts to import sonic-py-common package

[jleveque]

- Why I did it

As part of consolidating all common Python-based functionality into the new sonic-py-common package, this pull request:

1. Redirects all Python applications/scripts in sonic-buildimage repo which previously imported sonic_device_util or sonic_daemon_base to instead import sonic-py-common, which was added to the 201911 branch in [201911] Introduce sonic-py-common package #5063
2. Replaces all calls to sonic_device_util.get_platform_info() to instead call sonic_py_common.get_platform() and removes any calls to sonic_device_util.get_machine_info() which are no longer necessary (i.e., those which were only used to pass the results to sonic_device_util.get_platform_info().
3. Removes unused imports to the now-deprecated sonic-daemon-base package and sonic_device_util.py module

This is a step toward resolving #4999

- How to verify it

Test that all affected Python applications/scripts continue to function properly in 201911

[lgtm-com]

This pull request fixes 4 alerts when merging 9d8d8e4 into 13386c1 - view on LGTM.com

fixed alerts:

• 4 for Unused import