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/termios_darwin.go

@@ -8,7 +8,10 @@ import (
 const (
 	getTermios = syscall.TIOCGETA
 	setTermios = syscall.TIOCSETA
+)
 
+// Termios magic numbers, passthrough to the ones defined in syscall.
+const (
 	IGNBRK = syscall.IGNBRK
 	PARMRK = syscall.PARMRK
 	INLCR  = syscall.INLCR
@@ -29,6 +32,7 @@ const (
 	IEXTEN = syscall.IEXTEN
 )
 
+// Termios is the Unix API for terminal I/O.
 type Termios struct {
 	Iflag  uint64
 	Oflag  uint64