fix #2088 Miss context path when export a rest service explicitly

[kimmking]

What is the purpose of the change

fix #2088 Miss context path when export a rest service explicitly

Brief changelog

fix #2088 Miss context path when export a rest service explicitly

Verifying this change

test cases

[codecov-io]

Codecov Report

Merging #2092 into master will decrease coverage by <.01%.
The diff coverage is 60%.

@@             Coverage Diff              @@
##             master    #2092      +/-   ##
============================================
- Coverage     53.05%   53.04%   -0.01%     
+ Complexity     4957     4954       -3     
============================================
  Files           559      559              
  Lines         24894    24894              
  Branches       4432     4432              
============================================
- Hits          13207    13206       -1     
+ Misses         9667     9666       -1     
- Partials       2020     2022       +2

Impacted Files	Coverage Δ	Complexity Δ
...g/apache/dubbo/rpc/protocol/rest/RestProtocol.java	65.57% <60%> (ø)	15 <2> (ø)	⬇️
...apache/dubbo/rpc/protocol/rest/BaseRestServer.java	88.88% <0%> (-11.12%)	7% <0%> (-1%)
...org/apache/dubbo/rpc/filter/ActiveLimitFilter.java	83.33% <0%> (-5.56%)	6% <0%> (-1%)
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	51.89% <0%> (-2.54%)	11% <0%> (-1%)
...bo/remoting/transport/netty/NettyCodecAdapter.java	54.68% <0%> (+1.56%)	3% <0%> (ø)	⬇️
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	50% <0%> (+8.33%)	3% <0%> (ø)	⬇️

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