fix:ConfigChangeListener to ConfigFileChangeListener

[sunshanpeng]

declare：

private final List<ConfigFileChangeListener> m_listeners = Lists.newCopyOnWriteArrayList();

method：

@Override
  public boolean removeChangeListener(ConfigChangeListener listener) {
    return m_listeners.remove(listener);
  }

[codecov-io]

Codecov Report

Merging #2623 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2623      +/-   ##
============================================
+ Coverage     50.05%   50.07%   +0.01%     
- Complexity     2046     2047       +1     
============================================
  Files           412      412              
  Lines         12593    12593              
  Branches       1291     1291              
============================================
+ Hits           6304     6306       +2     
+ Misses         5841     5840       -1     
+ Partials        448      447       -1

Impacted Files	Coverage Δ	Complexity Δ
...framework/apollo/internals/AbstractConfigFile.java	85.71% <ø> (ø)	11 <0> (ø)	⬇️
.../apollo/internals/RemoteConfigLongPollService.java	80.24% <0%> (+1.23%)	28% <0%> (+1%)	⬆️

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[coveralls]

Coverage increased (+0.008%) to 53.625% when pulling 50781e6 on sunshanpeng:master into 0fcce20 on ctripcorp:master.

[nobodyiam]

Thanks!