fix: adapt to the scenario that the ConfigService sets context-path (#3316)

[nisiyong]

What's the purpose of this PR

After setting context-path in ConfigService, the AccessKey feature went wrong.
This PR fixes such a scenario.

Which issue(s) this PR fixes:

Fixes #3316

Brief changelog

Replace request.getServletPath() with request.getRequestURI(), when ClientAuthenticationFilter get the request path from client.

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 #3320 into master will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3320      +/-   ##
============================================
- Coverage     51.49%   51.43%   -0.07%     
+ Complexity     2306     2302       -4     
============================================
  Files           442      442              
  Lines         13738    13738              
  Branches       1398     1398              
============================================
- Hits           7075     7066       -9     
- Misses         6175     6180       +5     
- Partials        488      492       +4     

Impacted Files	Coverage Δ	Complexity Δ
...nfigservice/filter/ClientAuthenticationFilter.java	91.30% <100.00%> (ø)	14.00 <0.00> (ø)
...rk/apollo/spring/property/SpringValueRegistry.java	83.33% <0.00%> (-5.56%)	10.00% <0.00%> (-1.00%)
...ework/apollo/internals/RemoteConfigRepository.java	86.25% <0.00%> (-3.13%)	24.00% <0.00%> (-1.00%)
.../framework/apollo/spring/property/SpringValue.java	87.71% <0.00%> (-1.76%)	20.00% <0.00%> (-1.00%)
...ervice/service/ReleaseMessageServiceWithCache.java	84.70% <0.00%> (-1.18%)	23.00% <0.00%> (-1.00%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4d49504...d6a89d2. Read the comment docs.

[nobodyiam]

LGTM