HttpRunner 2.0 is comming!

1, new design for testcase format;
2, refactor testcase layer mechanism.

tests/data/demo_testcase_functions.yml

@@ -5,11 +5,7 @@
         - device_sn: ${gen_random_string(15)}
         - os_platform: 'ios'
         - app_version: '2.8.6'
-    request:
-        base_url: ${get_base_url()}
-        headers:
-            Content-Type: application/json
-            device_sn: $device_sn
+    base_url: ${get_base_url()}
 
 - test:
     name: get token
@@ -38,6 +34,8 @@
         url: /api/users/1000
         method: POST
         headers:
+            Content-Type: application/json
+            device_sn: $device_sn
             token: $token
         json:
             name: $user_name
@@ -52,6 +50,8 @@
         url: /api/users/1000
         method: POST
         headers:
+            Content-Type: application/json
+            device_sn: $device_sn
             token: $token
         json:
             name: "user1"