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>

signal/signal.go

@@ -1,3 +1,5 @@
+// Package signal provides helper functions for dealing with signals across
+// various operating systems.
 package signal
 
 import (
@@ -5,6 +7,7 @@ import (
 	"os/signal"
 )
 
+// CatchAll catches all signals and relays them to the specified channel.
 func CatchAll(sigc chan os.Signal) {
 	handledSigs := []os.Signal{}
 	for _, s := range SignalMap {
@@ -13,6 +16,7 @@ func CatchAll(sigc chan os.Signal) {
 	signal.Notify(sigc, handledSigs...)
 }
 
+// StopCatch stops catching the signals and closes the specified channel.
 func StopCatch(sigc chan os.Signal) {
 	signal.Stop(sigc)
 	close(sigc)