fix the issue that access key function doesn't work when prefix path is configured

[nobodyiam]

What's the purpose of this PR

fix the issue that access key function doesn't work when prefix path is configured

Brief changelog

1. change prefix path key from prefixPath to prefix.path
2. fix the incompatible path in access key pages

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[codecov-io]

Codecov Report

Merging #2929 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2929   +/-   ##
=========================================
  Coverage     51.24%   51.24%           
  Complexity     2218     2218           
=========================================
  Files           431      431           
  Lines         13300    13300           
  Branches       1366     1366           
=========================================
  Hits           6815     6815           
  Misses         6009     6009           
  Partials        476      476

Impacted Files	Coverage Δ	Complexity Δ
...apollo/portal/controller/PrefixPathController.java	50% <ø> (ø)	1 <0> (ø)	⬇️

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[coveralls]

Coverage remained the same at 54.82% when pulling c2b64ec on nobodyiam:fix-prefix-path-for-access-key into ffc33fb on ctripcorp:master.

[wu560130911]

是否可以提供默认值？我没有做任何配置时，直接无法打开页面，毕竟大部分使用方都不是这么代理访问的
app.js:3 Uncaught ReferenceError: prefixPath is not defined
at app.js:3
(anonymous) @ app.js:3
AppUtils.js:1 Uncaught TypeError: Cannot read property 'service' of undefined
at AppUtils.js:1
(anonymous) @ AppUtils.js:1
directive.js:2 Uncaught TypeError: Cannot read property 'directive' of undefined
at directive.js:2
(anonymous) @ directive.js:2
LoginController.js:1 Uncaught TypeError: Cannot read property 'controller' of undefined
at LoginController.js:1

[nobodyiam]

@wu560130911 默认值就是空，看下是否请求后端接口报错了