Add a --no-interactive switch to func host start and func run to enable integration testing

[jonathanfishbein1]

With a -Nointeractive flag to facilitate CI. Currently vsts build agent is throwing error
'This operation requires an interactive window station'

[lindydonna]

@jonathanfishbein1 What is the scenario where you want this? Do you want to run tests in a non-interactive session?

[jonathanfishbein1]

@lindydonna
Yes I want to func host start and then run integration tests with WebRequest against it.