feat(API)：增加TsgAPI接口测试用例

Keyring策略文件、
可信证书颁发机构策略文件、
内容劫持策略文件、
访问阻断页面策略文件、
注入脚本策略文件、
流量转发目的地址配置和中间证书

01-TestCase/tsg_bfapi/policy_file_interface/TrustedCertPolicy.robot

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+*** Settings ***
+Test Teardown    TeardownDelete    ${url}    certIds    ${certId}
+Force Tags    tsg_bf_api    Trusted_Certificate_Authorities
+Library    String
+Library    OperatingSystem
+Library    Selenium2Library
+Library    Collections
+Resource    ../../../02-Keyword/tsg_bfapi/common.robot
+Resource    ../../../02-Keyword/tsg_bfapi/policy_file_interface/functionalKeywords.robot
+Resource    ../../../03-Variable/bifangapivariable.txt
+
+*** Variables ***
+${url}    /policy/profile/trustedcacertobj
+${certId}    ${EMPTY}
+
+*** Test Cases ***
+Trusted Cert Policy CRUD case
+    
+    # 新增
+    ${response}    CreatePolicyFile    ${url}    Keyrings/root/    tango-ca-trust-ca-cer.pem
+
+    # 查询
+    ${certId}    Get From Dictionary    ${response}    certId
+    ${certName}    Get From Dictionary    ${response}    certName
+    QueryPolicyFile    ${url}    certId=${certId}&certName=${certName}    
+    
+    # 修改
+    ${header_edit}    Set Variable   {"isValid":1,"opAction":"update","certName":"test_edit","certId":"${certId}","returnData":1}
+    UpdatePolicyFile    ${url}    Keyrings/Intermediate/    tang-ca-v3-intermediate-01-cer.pem   ${header_edit}
+