add new feature: parameters

tests/testsuites/create_users_with_parameters.yml

@@ -0,0 +1,16 @@
+config:
+    name: create users with uid
+    variables:
+        device_sn: ${gen_random_string(15)}
+    base_url: "http://127.0.0.1:5000"
+
+testcases:
+    create user $uid and check result for $device_sn.:
+        testcase: testcases/create_and_check.yml
+        weight: 2
+        variables:
+            uid: 1000
+            device_sn: TESTSUITE_XXX
+        parameters:
+            uid: [101, 102, 103]
+            device_sn: [TESTSUITE_X1, TESTSUITE_X2]