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>

units/duration.go

@@ -1,3 +1,5 @@
+// Package units provides helper function to parse and print size and time units
+// in human-readable format.
 package units
 
 import (
@@ -6,7 +8,7 @@ import (
 )
 
 // HumanDuration returns a human-readable approximation of a duration
-// (eg. "About a minute", "4 hours ago", etc.)
+// (eg. "About a minute", "4 hours ago", etc.).
 func HumanDuration(d time.Duration) string {
 	if seconds := int(d.Seconds()); seconds < 1 {
 		return "Less than a second"