Add ability to run test stage in docker

Change-Id: I15781fc22a900fa5a77d89acabf250eca19582c1
PROD:19622
diff --git a/jenkins/client/job/salt-formulas/tests.yml b/jenkins/client/job/salt-formulas/tests.yml
index 07a8fb4..d2f1199 100644
--- a/jenkins/client/job/salt-formulas/tests.yml
+++ b/jenkins/client/job/salt-formulas/tests.yml
@@ -176,6 +176,12 @@
               PARALLEL_GROUP_SIZE:
                 type: string
                 default: "8"
+              RUN_TEST_IN_DOCKER:
+                type: boolean
+                description: "Run test stage in docker environment"
+              SMOKE_TEST_DOCKER_IMG:
+                type: string
+                default: "ubuntu:16.04"
       job:
         test-salt-formulas-env:
           name: test-salt-formulas-env