Remove RPC context in RpcContextTest.testObject

[lzx404243]

What is the purpose of the change

The test org.apache.dubbo.rpc.RpcContextTest.testObject is not idempotent and fails if run twice in the same JVM, because it pollutes state shared among tests. It may be good to clean this state pollution so that some other tests do not fail in the future due to the shared state polluted by this test. (See PR #6314 for an example of how this could cause issues)

Brief changelog

In RpcContextTest.testObject(), call RpcContext.removeContext() to clear remove the RPC context when the test finishes.

Verifying this change

With the proposed fix, the test does not pollute the shared state (and passes when run twice in the same JVM).

[codecov-io]

Codecov Report

Merging #5 (6d5ce0a) into master (3fc2d10) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master       #5      +/-   ##
============================================
+ Coverage     57.82%   57.90%   +0.07%     
- Complexity      423      424       +1     
============================================
  Files          1050     1050              
  Lines         43358    43358              
  Branches       6263     6263              
============================================
+ Hits          25073    25105      +32     
+ Misses        15467    15447      -20     
+ Partials       2818     2806      -12     

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/apache/dubbo/config/DubboShutdownHook.java	63.82% <0.00%> (-6.39%)	0.00% <0.00%> (ø%)
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	62.88% <0.00%> (-1.04%)	0.00% <0.00%> (ø%)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	41.70% <0.00%> (-0.33%)	0.00% <0.00%> (ø%)
...n/java/org/apache/dubbo/common/utils/UrlUtils.java	74.25% <0.00%> (+0.33%)	0.00% <0.00%> (ø%)
...figcenter/file/FileSystemDynamicConfiguration.java	61.90% <0.00%> (+0.47%)	0.00% <0.00%> (ø%)
...pache/dubbo/registry/support/FailbackRegistry.java	65.42% <0.00%> (+0.93%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0.00%> (+1.13%)	19.00% <0.00%> (+1.00%)
.../src/main/java/org/apache/dubbo/rpc/RpcStatus.java	72.61% <0.00%> (+1.19%)	0.00% <0.00%> (ø%)
...pache/dubbo/registry/support/AbstractRegistry.java	80.00% <0.00%> (+1.48%)	0.00% <0.00%> (ø%)
...ava/org/apache/dubbo/config/ServiceConfigBase.java	58.95% <0.00%> (+1.73%)	0.00% <0.00%> (ø%)
... and 9 more

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