import github.com/syndtr/gocapability will auto read /proc/sys/kernel/cap_last_cap

[ningmingxiao]

gocapability/capability/capability_linux.go

Line 47 in 42c35b4

func initLastCap() error {

runc --help will read file "/proc/sys/kernel/cap_last_cap" I want read it when I need.

[ningmingxiao]

ping @syndtr
some issue opencontainers/runc#4356