Match sock file default to systemd setup.

The `AdminListen` option and `yggdrasilctl` now default to
`unix:///var/run/yggdrasil/yggdrasil.sock` on Linux

This allows yggdrasil to be run as its own user.

Closes #802

CHANGELOG.md

@@ -25,6 +25,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - in case of vulnerabilities.
 -->
 
+## [future]
+
+### Changed
+- The `AdminListen` option and `yggdrasilctl` now default to `unix:///var/run/yggdrasil/yggdrasil.sock` on Linux
+
+
 ## [0.4.2] - 2021-11-03
 ### Fixed
 - Reverted a dependency update which resulted in problems building with Go 1.16 and running on Windows

src/defaults/defaults_linux.go

@@ -8,7 +8,7 @@ package defaults
 func GetDefaults() platformDefaultParameters {
 	return platformDefaultParameters{
 		// Admin
-		DefaultAdminListen: "unix:///var/run/yggdrasil.sock",
+		DefaultAdminListen: "unix:///var/run/yggdrasil/yggdrasil.sock",
 
 		// Configuration (used for yggdrasilctl)
 		DefaultConfigFile: "/etc/yggdrasil.conf",