remove unused files

tests/data/demo_binds.yml

@@ -1,10 +0,0 @@
-bind_variables:
-    variables:
-        TOKEN: "debugtalk"
-        token: $TOKEN
-
-builtin_functions:
-    variables:
-        length: ${len(debugtalk)}
-        smallest: ${min(2, 3, 8)}
-        largest: ${max(2, 3, 8)}

tests/data/demo_parameters.yml

@@ -1,25 +0,0 @@
-- config:
-    name: "user management testcase."
-    parameters:
-        user_agent: ["iOS/10.1", "iOS/10.2", "iOS/10.3"]
-        username-password:
-            - ["test1","111111"]
-            - ["test2","222222"]
-    variables:
-        username: test1
-        user_agent: "iOS/10.1"
-        device_sn: ${gen_random_string(15)}
-        os_platform: 'ios'
-        app_version: 2.8.5
-    base_url: ${get_base_url()}
-    output:
-        - token
-
-- test:
-    name: get token with $user_agent and $username
-    api: api/get_token.yml
-    extract:
-        - token: content.token
-    validate:
-        - "eq": ["status_code", 200]
-        - "len_eq": ["content.token", 16]