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
diff --git a/tests/build.gradle b/tests/build.gradle
index 32275c2..c58717a 100644
--- a/tests/build.gradle
+++ b/tests/build.gradle
@@ -20,6 +20,7 @@
     exclude '**/*Python*'
     exclude '**/*ThrottleTests*'
     exclude '**/MaxActionDurationTests*'
+    exclude '**/*ApiGwTests*'
 // Add all images needed for local testing here