E2E nginx outbound access test: simplify port test (#2204)
E2E nginx outbound access test: simplify port test (#2204)

* replace curl with nc

* what does output look like on mismatch?

* We are testing for outbound internet access

not web content matching

* testing curl for err

* real tests, and not installing curl a bunch of times

Azure/acs-engine,yangl900/acs-engine,Azure/acs-engine,rjtsdl/acs-engine,yangl900/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,rjtsdl/acs-engine,yangl900/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,rjtsdl/acs-engine,jackfrancis/acs-engine,rjtsdl/acs-engine,yangl900/acs-engine,jackfrancis/acs-engine,yangl900/acs-engine,rjtsdl/acs-engine