[Platform API][SFP] Log warnings, don't fail test if newly-added xcvr info fields missing

[jleveque]

Description of PR

Summary: Log warnings, don't fail test if newly-added xcvr info fields missing in test_get_transceiver_info SFP platform API test

Fixes: #2983

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Approach

What is the motivation for this PR?

Some vendors currently use their own SFP EEPROM parsing logic instead of using common logic in the sonic-platform-common repo. Thus, when a new field is added in the common code, if a vendor does not utilize the common code but rather implements their own parsing logic, their parser will not provide this field until the vendor adds logic to do so.

We are planning to refactor the sonic_sfp code in sonic-platform-common in hopes of making it easier for vendors to utilize the common code and move away from using their own parsers. Until then, this patch prevents the test case from failing if recently-added fields are not present, and instead logs warning messages, which should alert the vendor that they need to parse the new field(s).

How did you do it?

Remove recently-added fields from list of expected keys and add to a new list of newly-added keys. If keys in the newly-added list aren't present, log warnings to alert the vendor that they need to update their parser (or preferably use the common parser).

How did you verify/test it?

Tested against an S6100. Test case passes and the following logs are seen:

23:57:33 WARNING test_sfp.py:test_get_transceiver_info:238: test_get_transceiver_info: Transceiver 0 info missing field 'type_abbrv_name'. Vendor needs to add support.
23:57:33 WARNING test_sfp.py:test_get_transceiver_info:240: test_get_transceiver_info: Transceiver 0 info value for 'application_advertisement' is 'N/A'. Vendor needs to add support.
23:57:33 WARNING test_sfp.py:test_get_transceiver_info:238: test_get_transceiver_info: Transceiver 0 info missing field 'is_replaceable'. Vendor needs to add support.
23:57:33 WARNING test_sfp.py:test_get_transceiver_info:238: test_get_transceiver_info: Transceiver 0 info missing field 'dom_capability'. Vendor needs to add support.

[AntonHryshchuk]

Looks good for me.
Thank you Joe.