Migrate a bunch of stuff around to prep for worker command (#2)

Right now it's essentially a copy; it needs some updating, integration
into dev, and so on.

internal/cmd/commands/controller/controller.go

@@ -54,7 +54,7 @@ Usage: watchtower controller [options]
 
   Start a controller with a configuration file:
 
-      $ watchtower controller -config=/etc/controller/config.hcl
+      $ watchtower controller -config=/etc/watchtower/controller.hcl
 
   For a full list of examples, please see the documentation.
 
@@ -147,15 +147,15 @@ func (c *Command) Run(args []string) int {
 		return result
 	}
 
-	if memProfilerEnabled {
-		c.startMemProfiler()
-	}
-
 	if err := c.SetupLogging(c.flagLogLevel, c.flagLogFormat, c.Config.LogLevel, c.Config.LogFormat); err != nil {
 		c.UI.Error(err.Error())
 		return 1
 	}
 
+	if memProfilerEnabled {
+		base.StartMemProfiler(c.Logger)
+	}
+
 	if err := c.SetupMetrics(c.UI, c.Config.Telemetry); err != nil {
 		c.UI.Error(err.Error())
 		return 1
@@ -259,21 +259,21 @@ func (c *Command) ParseFlagsAndConfig(args []string) int {
 
 func (c *Command) Start() int {
 	// Instantiate the wait group
-	controllerConfig := &controller.Config{
+	conf := &controller.Config{
 		RawConfig: c.Config,
 		Server:    c.Server,
 	}
 
 	// Initialize the core
-	controller, err := controller.New(controllerConfig)
+	ctlr, err := controller.New(conf)
 	if err != nil {
 		c.UI.Error(fmt.Sprintf("Error initializing controller: %w", err))
 		return 1
 	}
 
-	if err := controller.Start(); err != nil {
+	if err := ctlr.Start(); err != nil {
 		c.UI.Error(fmt.Sprint("Error starting controller: %w", err))
-		if err := controller.Shutdown(); err != nil {
+		if err := ctlr.Shutdown(); err != nil {
 			c.UI.Error(fmt.Sprintf("Error with controller shutdown: %w", err))
 		}
 		return 1
@@ -287,7 +287,7 @@ func (c *Command) Start() int {
 		case <-c.ShutdownCh:
 			c.UI.Output("==> Watchtower controller shutdown triggered")
 
-			if err := controller.Shutdown(); err != nil {
+			if err := ctlr.Shutdown(); err != nil {
 				c.UI.Error(fmt.Sprintf("Error with controller shutdown: %w", err))
 			}
 
@@ -337,7 +337,7 @@ func (c *Command) Start() int {
 					c.Logger.Error("unknown log level found on reload", "level", newConf.LogLevel)
 					goto RUNRELOADFUNCS
 				}
-				controller.SetLogLevel(level)
+				ctlr.SetLogLevel(level)
 			}
 
 		RUNRELOADFUNCS: