DellEMC: N3248TE Initial platform commit

[arunlk-dell]

Why I did it

Added support for the device N3248TE

How I did it

Implemented the support for the platform N3248TE

Switch Vendor: DellEMC

• Switch SKU: N3248TE
• ASIC Vendor: Broadcom
• SONiC Image: sonic-broadcom.bin

How to verify it

Verified the show platform commands

n3248te_unit_test_log.txt

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)

[lgtm-com]

This pull request introduces 61 alerts when merging 6b66dbf1362764a1be032fc4f26f735ae027fe6a into 4049067 - view on LGTM.com

new alerts:

• 22 for Unused import
• 17 for Except block handles 'BaseException'
• 7 for Wrong number of arguments in a class instantiation
• 5 for Variable defined multiple times
• 3 for Unused local variable
• 3 for Result of integer division may be truncated
• 1 for Module imports itself
• 1 for Unreachable code
• 1 for 'import *' may pollute namespace
• 1 for Wrong name for an argument in a class instantiation

[lgtm-com]

This pull request introduces 13 alerts when merging 15620b3 into 34dddb8 - view on LGTM.com

new alerts:

• 7 for Wrong number of arguments in a class instantiation
• 3 for Result of integer division may be truncated
• 1 for Module imports itself
• 1 for 'import *' may pollute namespace
• 1 for Wrong name for an argument in a class instantiation

[jeff-yin]

Requesting @sujinmkang and/or @prgeor to review

[arunlk-dell]

@sujinmkang @prgeor
Have addressed the LGTM alerts, the wrong name/number of the argument alerts are due to different platform definitions.
And 'result of integer division may be truncated' alert can be ignored in python3
Can you review and merge the pull request.