Wait for test server to be ready before running tests (#605)
Wait for test server to be ready before running tests (#605)

* Wait for test server to be ready before running tests

This fixes problems when running the acceptance tests in slow or CPU-starved
machines, as mentioned in #472.

tyrken/alertmanager,joehandzik/alertmanager,brunoqc/alertmanager,GoogleCloudPlatform/alertmanager,tinytub/alertmanager,Kellel/alertmanager,prometheus/alertmanager,tinytub/alertmanager,tinytub/alertmanager,GoogleCloudPlatform/alertmanager,Aloomaio/alertmanager,tyrken/alertmanager,Kellel/alertmanager,prometheus/alertmanager,Aloomaio/alertmanager,Aloomaio/alertmanager,tyrken/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,brunoqc/alertmanager,prometheus/alertmanager,brunoqc/alertmanager,tyrken/alertmanager,GoogleCloudPlatform/alertmanager,joehandzik/alertmanager,joehandzik/alertmanager,Kellel/alertmanager,brunoqc/alertmanager