util/syspolicy: add some additional policy keys

These policy keys are supported on Apple platforms in Swift code; in
order to support them on platforms using Go (e.g. Windows), they also
need to be recorded here.

This does not affect any code, it simply adds the constants for now.

Updates ENG-2240
Updates ENG-2127
Updates ENG-2133

Change-Id: I0aa9863a3641e5844479da3b162761452db1ef42
Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>

util/syspolicy/policy_keys.go

@@ -16,6 +16,8 @@ const (
 	EnableIncomingConnections Key = "AllowIncomingConnections"
 	EnableServerMode          Key = "UnattendedMode"
 	ExitNodeAllowLANAccess    Key = "ExitNodeAllowLANAccess"
+	EnableTailscaleDNS        Key = "EnableTailscaleDNSSettings"
+	EnableTailscaleSubnets    Key = "EnableTailscaleSubnets"
 
 	// Keys with a string value that controls visibility: "show", "hide".
 	// The default is "show" unless otherwise stated.
@@ -25,6 +27,8 @@ const (
 	UpdateMenuVisibility      Key = "UpdateMenu"
 	RunExitNodeVisibility     Key = "RunExitNode"
 	PreferencesMenuVisibility Key = "PreferencesMenu"
+	ExitNodeMenuVisibility    Key = "ExitNodesPicker"
+	AutoUpdateVisibility      Key = "ApplyUpdates"
 
 	// Keys with a string value formatted for use with time.ParseDuration().
 	KeyExpirationNoticeTime Key = "KeyExpirationNotice" // default 24 hours