API GW V2 - Add 'wsk api` command (#2068)

* API GW V2 CLI - Add 'wsk api' command
- Support both 'wsk api-experimental' and 'wsk api' commands (separate PR wil deprecate `api-experimental`)
- 'wsk api' command requires that the target action exist and that it's a web action

* API GW V2 CLI - 'wsk api' tests
* Add "COMING SOON" label to 'wsk api' help
* API update needs additional param
* Reduce travis test execution time
1 file changed