Add inbucket docker image to allow local and automated testing of emails (#4901)

* add docker container for inbucket

* Add way to get the emails using inbucket and add a test for reset password

* add config setting to send emails

* update TestEmailTest

update

* add another test and fix wrong assert

* update per review

fix lint

change senders email

* Revert config.json to default values for EmailSettings section

* update test

* add setup to make the test run

api/apitestlib.go

@@ -59,6 +59,10 @@ func Setup() *TestHelper {
 		utils.InitTranslations(utils.Cfg.LocalizationSettings)
 		utils.Cfg.TeamSettings.MaxUsersPerTeam = 50
 		*utils.Cfg.RateLimitSettings.Enable = false
+		utils.Cfg.EmailSettings.SendEmailNotifications = true
+		utils.Cfg.EmailSettings.SMTPServer = "dockerhost"
+		utils.Cfg.EmailSettings.SMTPPort = "2500"
+		utils.Cfg.EmailSettings.FeedbackEmail = "test@example.com"
 		utils.DisableDebugLogForTest()
 		app.NewServer()
 		app.InitStores()