refactor api loading behavior: api should be located in /tests/api/ folder

tests/data/api.yml

@@ -1,26 +0,0 @@
-- api:
-    def: get_token($user_agent, $device_sn, $os_platform, $app_version)
-    request:
-        url: /api/get-token
-        method: POST
-        headers:
-            user_agent: $user_agent
-            device_sn: $device_sn
-            os_platform: $os_platform
-            app_version: $app_version
-        json:
-            sign: ${get_sign($user_agent, $device_sn, $os_platform, $app_version)}
-    validators:
-        - {"check": "status_code", "comparator": "eq", "expected": 200}
-        - {"check": "content.token", "comparator": "len_eq", "expected": 16}
-
-- api:
-    def: create_user($uid, $user_name, $user_password, $token)
-    request:
-        url: /api/users/$uid
-        method: POST
-        headers:
-            token: $token
-        json:
-            name: $user_name
-            password: $user_password