Lint on pkg/* packages

- pkg/useragent
- pkg/units
- pkg/ulimit
- pkg/truncindex
- pkg/timeoutconn
- pkg/term
- pkg/tarsum
- pkg/tailfile
- pkg/systemd
- pkg/stringutils
- pkg/stringid
- pkg/streamformatter
- pkg/sockets
- pkg/signal
- pkg/proxy
- pkg/progressreader
- pkg/pools
- pkg/plugins
- pkg/pidfile
- pkg/parsers
- pkg/parsers/filters
- pkg/parsers/kernel
- pkg/parsers/operatingsystem

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

term/tc_linux_cgo.go

@@ -10,6 +10,9 @@ import (
 // #include <termios.h>
 import "C"
 
+// Termios is the Unix API for terminal I/O.
+// It is passthgrouh for syscall.Termios in order to make it portable with
+// other platforms where it is not available or handled differently.
 type Termios syscall.Termios
 
 // MakeRaw put the terminal connected to the given file descriptor into raw