Merge pull request #2842 from vaLski/supress_sigpipe_logging

Supress signal logging on SIGPIPE. Should address #2768

command/agent/command.go

@@ -1171,13 +1171,14 @@ WAIT:
 		// Agent is already shutdown!
 		return 0
 	}
-	c.Ui.Output(fmt.Sprintf("Caught signal: %v", sig))
 
-	// Skip SIGPIPE signals
+	// Skip SIGPIPE signals and skip logging whenever such signal is received as well
 	if sig == syscall.SIGPIPE {
 		goto WAIT
 	}
 
+	c.Ui.Output(fmt.Sprintf("Caught signal: %v", sig))
+
 	// Check if this is a SIGHUP
 	if sig == syscall.SIGHUP {
 		conf, err := c.handleReload(config)