use daemon threads for thread pools

[nobodyiam]

No description provided.

[coveralls]

Coverage remained the same at 50.527% when pulling 0f60cf9 on nobodyiam:use-daemon-threads into ce521b2 on ctripcorp:master.

[codecov-io]

Codecov Report

Merging #795 into master will not change coverage.
The diff coverage is 75%.

@@            Coverage Diff            @@
##             master     #795   +/-   ##
=========================================
  Coverage     47.04%   47.04%           
  Complexity     1544     1544           
=========================================
  Files           352      352           
  Lines          9682     9682           
  Branches        959      959           
=========================================
  Hits           4555     4555           
  Misses         4790     4790           
  Partials        337      337

Impacted Files	Coverage Δ	Complexity Δ
...mework/apollo/common/config/RefreshableConfig.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...o/portal/component/AdminServiceAddressLocator.java	67.44% <100%> (ø)	7 <0> (ø)	⬇️
...mework/apollo/portal/component/PortalSettings.java	55% <100%> (ø)	5 <0> (ø)	⬇️
.../apollo/portal/listener/ConfigPublishListener.java	6.52% <100%> (ø)	2 <1> (ø)	⬇️

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[lepdou]

cool