increase wait time for node readiness to 15 mins (#1537)
increase wait time for node readiness to 15 mins (#1537)

* increase wait time for node readiness to 15 mins

* using cfg.Timeout so timeout is configurable

yangl900/acs-engine,shrutir25/acs-engine,weinong/acs-engine,Azure/acs-engine,yangl900/acs-engine,rjtsdl/acs-engine,clementnero/acs-engine,anhowe/acs-engine,rocketraman/acs-engine,yangl900/acs-engine,anhowe/acs-engine,shrutir25/acs-engine,rjtsdl/acs-engine,anhowe/acs-engine,rocketraman/acs-engine,shrutir25/acs-engine,PwC-ASD/acs-engine,Azure/acs-engine,shrutir25/acs-engine,shrutir25/acs-engine,Azure/acs-engine,weinong/acs-engine,weinong/acs-engine,PwC-ASD/acs-engine,yangl900/acs-engine,rocketraman/acs-engine,PwC-ASD/acs-engine,rjtsdl/acs-engine,anhowe/acs-engine,weinong/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,weinong/acs-engine,jackfrancis/acs-engine,rocketraman/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,clementnero/acs-engine,clementnero/acs-engine,yangl900/acs-engine,PwC-ASD/acs-engine,rjtsdl/acs-engine,anhowe/acs-engine,jackfrancis/acs-engine,jackfrancis/acs-engine,rjtsdl/acs-engine