fix auto update not triggered issue

[nobodyiam]

fix the auto update not triggered issue when there are same keys in different namespaces and the one with high priority deleted.

[codecov-io]

Codecov Report

Merging #1013 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1013      +/-   ##
============================================
+ Coverage     48.62%   48.63%   +<.01%     
- Complexity     1672     1673       +1     
============================================
  Files           364      364              
  Lines         10144    10147       +3     
  Branches       1026     1027       +1     
============================================
+ Hits           4933     4935       +2     
  Misses         4849     4849              
- Partials        362      363       +1

Impacted Files	Coverage Δ	Complexity Δ
...pring/property/AutoUpdateConfigChangeListener.java	91.22% <100%> (+0.48%)	16 <2> (+2)	⬆️
...ervice/service/ReleaseMessageServiceWithCache.java	85.71% <0%> (-1.2%)	24% <0%> (-1%)

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[coveralls]

Coverage increased (+0.01%) to 52.212% when pulling 6267020 on nobodyiam:fix-auto-update-with-deleted-keys into 8ffa3bf on ctripcorp:master.