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.