Add support for Function and Trigger domain objects (#1060)

Vast commit, includes:

 * Introduces the Trigger domain entity.
 * Introduces the Fns domain entity.
 * V2 of the API for interacting with the new entities in swaggerv2.yml
 * Adds v2 end points for Apps to support PUT updates.
 * Rewrites the datastore level tests into a new pattern.
 * V2 routes use entity ID over name as the path parameter.

api/logs/testing/test.go

@@ -26,8 +26,6 @@ var testRoute = &models.Route{
 }
 
 func SetupTestCall(t *testing.T, ctx context.Context, ls models.LogStore) *models.Call {
-	testApp.SetDefaults()
-
 	var call models.Call
 	call.AppID = testApp.ID
 	call.CreatedAt = common.DateTime(time.Now())