Merge branch 'master' into alerting_reminder

* master: (30 commits)
  changelog: add notes about closing #11882
  renamed variable in tests
  added comment, variableChange -> variableValueChange
  added a test
  added if to check if new variable has been added
  Gravatar fallback does not respect 'AppSubUrl'-setting (#12149)
  change admin password after first login
  changelog: adds note about closing #11958
  revert: reverted singlestat panel position change PR #12004
  Revert "provisioning: turn relative symlinked path into absolut paths"
  provisioning: turn relative symlinked path into absolut paths
  changelog: adds note about closing #11670
  elasticsearch: sort bucket keys to fix issue wth response parser tests
  docs: what's new in v5.2
  changelog: add notes about closing #11167
  docs: docker secrets support. (#12141)
  alerting: show alerts for user with Viewer role
  datasource: added option no-direct-access to ds-http-settings diretive, closes #12138
  provisioning: adds fallback if evalsymlink/abs fails
  tests: uses different paths depending on os
  ...

pkg/api/dtos/models.go

@@ -52,7 +52,7 @@ type UserStars struct {
 
 func GetGravatarUrl(text string) string {
 	if setting.DisableGravatar {
-		return "/public/img/user_profile.png"
+		return setting.AppSubUrl + "/public/img/user_profile.png"
 	}
 
 	if text == "" {