fix: revert golang.org/x/sys bump to avoid FreeBSD regression#7780

Merged

hanshasselberg merged 3 commits intomasterfrom fix/sys-freebsd-regression

May 5, 2020

+90,754-14,034

Commits on May 4, 2020

Commits on May 5, 2020

update to tagged serf
hanshasselberg
committed