Add test for routed notifier
Add test for routed notifier

tbouvet/alertmanager,prometheus/alertmanager,joehandzik/alertmanager,ericgerling/alertmanager,prometheus/alertmanager,joehandzik/alertmanager,sarathsp06/alertmanager,ericgerling/alertmanager,tinytub/alertmanager,tinytub/alertmanager,Aloomaio/alertmanager,Kellel/alertmanager,tyrken/alertmanager,brunoqc/alertmanager,brancz/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,novilabs/alertmanager,tyrken/alertmanager,novilabs/alertmanager,sarathsp06/alertmanager,joehandzik/alertmanager,brunoqc/alertmanager,sarathsp06/alertmanager,pdf/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,novilabs/alertmanager,ericgerling/alertmanager,MonsantoCo/alertmanager,brunoqc/alertmanager,novilabs/alertmanager,MonsantoCo/alertmanager,tyrken/alertmanager,prometheus/alertmanager,tinytub/alertmanager,brunoqc/alertmanager,pdf/alertmanager,pdf/alertmanager,Aloomaio/alertmanager,MonsantoCo/alertmanager,Kellel/alertmanager,brancz/alertmanager,brancz/alertmanager,MonsantoCo/alertmanager,tbouvet/alertmanager,GoogleCloudPlatform/alertmanager,Aloomaio/alertmanager,Kellel/alertmanager,tyrken/alertmanager,pdf/alertmanager,tbouvet/alertmanager,brancz/alertmanager