"Buses" is the preferred plural of "bus"

Replace archaic "busses" with modern form "buses."

Intentionally excluded:

• Old/random drivers I didn't recognize
  • Old hardware in general
• Use of "busses" in code as identifiers

No functional change.

http://grammarist.com/spelling/buses-busses/

PR: 216099
Reported by: bltsrc at mail.ru
Sponsored by: Dell EMC Isilon