health check can be simpler

[sunshanpeng]

the check() method always return 0

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@437026f). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2642   +/-   ##
=========================================
  Coverage          ?   50.24%           
  Complexity        ?     2061           
=========================================
  Files             ?      413           
  Lines             ?    12644           
  Branches          ?     1292           
=========================================
  Hits              ?     6353           
  Misses            ?     5844           
  Partials          ?      447

Impacted Files	Coverage Δ	Complexity Δ
...lo/configservice/ConfigServiceHealthIndicator.java	100% <100%> (ø)	3 <1> (?)
...ollo/adminservice/AdminServiceHealthIndicator.java	100% <100%> (ø)	3 <1> (?)

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[coveralls]

Coverage increased (+0.001%) to 53.785% when pulling d8be1e3 on sunshanpeng:master into f050e44 on ctripcorp:master.

[JaredTan95]

The Previous code also confused to me, but as far as I concerned. The new code looks good to me.