[multiasic][sfputil]Fix the sftpuitlhelper on mutilasic platform issue

[mlok-nokia]

Description

read_porttab_mappings() is not able to get the multiasic port config. Modified function read_porttab_mapings() to pass the asic_name to allow the get_port_config() to get the port info for each asic. Also use the extend() and update() method to update the logical, logical_to_physical, phyiscal_to_logical lists. Also add the unit test case test_read_all_porttab_mappings() .

Motivation and Context

This change is required to handle the mutliasic platform. Fixes sonic-net/sonic-buildimage#10569

How Has This Been Tested?

The following output should be displayed without any error when using CLI command: sudo sfpulti show presence

admin@sonic:~$ sudo sfputil show presence
Port        Presence
----------  -----------
Ethernet0   Not present
Ethernet1   Not present
Ethernet2   Present
Ethernet3   Present
Ethernet4   Not present
Ethernet5   Not present
Ethernet6   Present
Ethernet7   Not present
Ethernet8   Not present
Ethernet9   Not present
Ethernet10  Not present
Ethernet11  Not present
Ethernet12  Not present
Ethernet13  Not present
Ethernet14  Not present
Ethernet15  Not present
Ethernet16  Not present
Ethernet17  Not present
Ethernet18  Not present
Ethernet19  Not present
Ethernet20  Not present
Ethernet21  Not present
Ethernet22  Not present
Ethernet23  Not present
Ethernet24  Present
Ethernet25  Present
Ethernet26  Present
Ethernet27  Not present
Ethernet28  Not present
Ethernet29  Not present
Ethernet30  Not present
Ethernet31  Not present
Ethernet32  Not present
Ethernet33  Not present
Ethernet34  Not present
Ethernet35  Not present
admin@sonic:~$ 

Additional Information (Optional)

[mlok-nokia]

@rlhui @judyjoseph @prgeor Please review this PR for sfputilhelper on multiasic platform issue. Thanks!

[mlok-nokia]

@rlhui @judyjoseph @prgeor Unit test case has been also added. Please review this PR.

[prgeor]

@dgsudharsan can you review?

[prgeor]

@mlok-nokia how are the changes in bcmshell.py related to the sfputil issue?

[prgeor]

@mlok-nokia can you test this in non-multi-asic platform?

[mlok-nokia]

We don't have any non-multi-asic platform to test this change. But there is an existing UT test_read_port_mappings() for the non-multi-asic case. Not sure if it is enough

[mlok-nokia]

@mlok-nokia how are the changes in bcmshell.py related to the sfputil issue?

This change has nothing to do with the sfputil. During the build/UT and PEP8/flake8 verification, it complains the syntax as warning. I just fix them in the same commit.