add access control support for admin service

[nobodyiam]

What's the purpose of this PR

Add access control support for admin service so that only trusted apollo portal could access admin service.

Instructions

Configurations for admin service

The following configurations can be set in ApolloConfigDB.ServerConfig.

• admin-service.access.control.enabled

Specify whether to enable access control for admin service or not. If set to true, then portal must pass the correct token when calling admin service.

Example:
admin-service.access.control.enabled=true

• admin-service.access.tokens

Specify the tokens allowed to call admin service, multiple tokens should be separated by ,.
If this configuration is empty, then the access control won't take effect.

Example:
admin-service.access.tokens=098f6bcd4621d373cade4e832627b4f6
admin-service.access.tokens=098f6bcd4621d373cade4e832627b4f6,ad0234829205b9033196ba818f7a872b

Configurations for portal

The following configurations can be set in ApolloPortalDB.ServerConfig.

• admin-service.access.tokens

Specify the access tokens for admin service in different environments in json format, e.g.

{
    "dev" : "098f6bcd4621d373cade4e832627b4f6",
    "pro" : "ad0234829205b9033196ba818f7a872b"
}

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.

[codecov-commenter]

Codecov Report

Merging #3233 into master will increase coverage by 0.44%.
The diff coverage is 92.39%.

@@             Coverage Diff              @@
##             master    #3233      +/-   ##
============================================
+ Coverage     51.05%   51.49%   +0.44%     
- Complexity     2270     2296      +26     
============================================
  Files           440      442       +2     
  Lines         13660    13739      +79     
  Branches       1389     1398       +9     
============================================
+ Hits           6974     7075     +101     
+ Misses         6199     6175      -24     
- Partials        487      489       +2     

Impacted Files	Coverage Δ	Complexity Δ
...m/ctrip/framework/apollo/biz/config/BizConfig.java	26.78% <0.00%> (-1.00%)	8.00 <0.00> (ø)
...k/apollo/portal/component/config/PortalConfig.java	22.82% <0.00%> (-0.26%)	9.00 <0.00> (ø)
...apollo/portal/component/RetryableRestTemplate.java	79.84% <90.90%> (+16.68%)	29.00 <7.00> (+9.00)
...lo/adminservice/AdminServiceAutoConfiguration.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)
...rvice/filter/AdminServiceAuthenticationFilter.java	100.00% <100.00%> (ø)	11.00 <11.00> (?)
...nfigservice/filter/ClientAuthenticationFilter.java	91.30% <100.00%> (ø)	14.00 <0.00> (ø)
...rip/framework/apollo/core/signature/Signature.java	80.00% <100.00%> (ø)	3.00 <0.00> (ø)
...o/openapi/filter/ConsumerAuthenticationFilter.java	94.11% <100.00%> (ø)	4.00 <0.00> (ø)
... and 5 more

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