fix(mixins/Config#get): fix missing entry error message

@xen-orchestra/mixins/Config.js

@@ -32,7 +32,7 @@ module.exports = class Config {
   get(path) {
     const value = get(this._config, path)
     if (value === undefined) {
-      throw new TypeError('missing config entry: ' + value)
+      throw new TypeError('missing config entry: ' + path)
     }
     return value
   }

CHANGELOG.unreleased.md

@@ -27,3 +27,7 @@
 > - major: if the change breaks compatibility
 >
 > In case of conflict, the highest (lowest in previous list) `$version` wins.
+
+- @xen-orchestra/mixins patch
+- @xen-orchestra/proxy patch
+- @xen-orchestra/xo-server patch