[202012][sonic_sfp]: prefer Config DB port index mapping over platform.json/port_config.ini

[nazariig]

Description

Approach:

1. Always use Config DB to get port mapping when it's available
2. When port mapping is missing in Config DB, use either platform.json or port_config.ini

On multiasic platforms the relevant Config DB instance will be used

Motivation and Context

• Always read port mapping from Config DB when it's available
• Fallback to platform.json or port_config.ini if needed

How Has This Been Tested?

• manually tested

Additional Information (Optional)

• N/A

[nazariig]

/azpw run

[mssonicbld]

/AzurePipelines run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 258 in repo Azure/sonic-platform-common

[prgeor]

@nazariig could you please check build error

[nazariig]

@prgeor seems to be an environmental issue:

Starting: Install Python dependencies
==============================================================================
Task         : Command line
Description  : Run a command line script using Bash on Linux and macOS and cmd.exe on Windows
Version      : 2.182.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/command-line
==============================================================================
Generating script.
========================== Starting Command Output ===========================
/bin/bash --noprofile --norc /__w/_temp/2c4b8f31-9c15-4c84-a0e1-7c3ea9af57f3.sh
+ sudo pip2 install swsssdk-2.0.1-py2-none-any.whl
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
WARNING: Requirement 'swsssdk-2.0.1-py2-none-any.whl' looks like a filename, but the file does not exist
Processing ./swsssdk-2.0.1-py2-none-any.whl
ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: '/__w/1/target/python-wheels/swsssdk-2.0.1-py2-none-any.whl'

##[error]Bash exited with code '1'.
Finishing: Install Python dependencies

[prgeor]

@prgeor seems to be an environmental issue:

Starting: Install Python dependencies
==============================================================================
Task         : Command line
Description  : Run a command line script using Bash on Linux and macOS and cmd.exe on Windows
Version      : 2.182.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/command-line
==============================================================================
Generating script.
========================== Starting Command Output ===========================
/bin/bash --noprofile --norc /__w/_temp/2c4b8f31-9c15-4c84-a0e1-7c3ea9af57f3.sh
+ sudo pip2 install swsssdk-2.0.1-py2-none-any.whl
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
WARNING: Requirement 'swsssdk-2.0.1-py2-none-any.whl' looks like a filename, but the file does not exist
Processing ./swsssdk-2.0.1-py2-none-any.whl
ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: '/__w/1/target/python-wheels/swsssdk-2.0.1-py2-none-any.whl'

##[error]Bash exited with code '1'.
Finishing: Install Python dependencies

Ack. python2 support has been removed in latest master, so i will have to update the pipeline to skip py2.

[nazariig]

@prgeor FYI. This fix is for Azure:202012 only

[prgeor]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[prgeor]

@samaity could you review this change?

[prgeor]

@nazariig looks like pipeline is failing because its downloading the artifacts from master branch. Can you fix https://github.com/Azure/sonic-platform-common/blob/master/azure-pipelines.yml#L30 as:

runBranch: 'refs/heads/202012'

[liat-grozovik]

/azp run Azure.sonic-platform-common

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).