move signals code to utils/

irc/server.go

 		listeners:    make(map[string]IRCListener),
 		logger:       logger,
 		rehashSignal: make(chan os.Signal, 1),
-		exitSignals:  make(chan os.Signal, len(ServerExitSignals)),
+		exitSignals:  make(chan os.Signal, len(utils.ServerExitSignals)),
 		defcon:       5,
 	}
 
 	}
 
 	// Attempt to clean up when receiving these signals.
-	signal.Notify(server.exitSignals, ServerExitSignals...)
+	signal.Notify(server.exitSignals, utils.ServerExitSignals...)
 	signal.Notify(server.rehashSignal, syscall.SIGHUP)
 
 	time.AfterFunc(alwaysOnExpirationPollPeriod, server.handleAlwaysOnExpirations)

irc/signals.go → irc/utils/signals.go

 // Copyright (c) 2020 Shivaram Lingamneni
 // released under the MIT license
 
-package irc
+package utils
 
 import (
 	"os"

irc/signals_plan9.go → irc/utils/signals_plan9.go

 // Copyright (c) 2020 Shivaram Lingamneni
 // released under the MIT license
 
-package irc
+package utils
 
 import (
 	"os"