add removeChangeListener api

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #1462 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1462      +/-   ##
============================================
+ Coverage     48.37%   48.39%   +0.02%     
  Complexity     1798     1798              
============================================
  Files           379      379              
  Lines         10928    10930       +2     
  Branches       1121     1121              
============================================
+ Hits           5286     5290       +4     
+ Misses         5254     5250       -4     
- Partials        388      390       +2

Impacted Files	Coverage Δ	Complexity Δ
...rip/framework/apollo/internals/AbstractConfig.java	81.01% <100%> (+0.16%)	49 <1> (+1)	⬆️
...ervice/service/ReleaseMessageServiceWithCache.java	85.71% <0%> (-1.2%)	24% <0%> (-1%)
...work/apollo/biz/message/DatabaseMessageSender.java	56.25% <0%> (+6.25%)	6% <0%> (ø)	⬇️

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[coveralls]

Coverage increased (+0.05%) to 51.967% when pulling 3f42821 on nobodyiam:remove-change-listener into ee4cfcc on ctripcorp:master.