opsgenie: Moved from deprecated, non documented teams to responders f…

…ield.

Teams config option will fail unmarshalling as it is deprecated.

Fixes #1818

Signed-off-by: Bartek Plotka <bwplotka@gmail.com>

# Conflicts:
#	notify/impl_test.go

config/notifiers.go

@@ -482,7 +482,7 @@ func (c *OpsGenieConfig) UnmarshalYAML(unmarshal func(interface{}) error) error
 
 	for _, r := range c.Responders {
 		if r.ID == "" && r.Username == "" && r.Name == "" {
-			return errors.Errorf("OpsGenieConfig responder %v has to have at least one of id, username or name specified")
+			return errors.Errorf("OpsGenieConfig responder %v has to have at least one of id, username or name specified", r)
 		}
 
 		r.Type = strings.ToLower(r.Type)