ifconfig(8): Display extended compliance code for SFP transceivers

[erj]

Summary

This change does two things:

• Update tables in net/sff8472.h and ifconfig's sfp.c with new entries in newer spec revisions of SFF-8472, SFF-8024, and SFF-8636
  • You can find the specs here: http://www.snia.org/sff/specifications
• Change get_sfp_transceiver_class() in ifconfig to read and display the extended compliance code if it exists. This was being done for QSFP transceivers in the function for QSFP transceivers, but not for SFP transceivers -- but SFP28 transceivers use this code to display 25G Ethernet capabilities.

Test Plan

Use ifconfig -v with an SFP/SFP+/SFP28 transceiver with a non-zero extended compliance code, and check that that the extended compliance code is displayed instead of a 10G/1G compliance code.