fix the performance issue when calling getHostName

[nobodyiam]

see #1986

[codecov-io]

Codecov Report

Merging #2152 into master will increase coverage by 7.54%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2152      +/-   ##
============================================
+ Coverage     49.97%   57.51%   +7.54%     
+ Complexity     1980     1120     -860     
============================================
  Files           401      193     -208     
  Lines         12403     5922    -6481     
  Branches       1276      636     -640     
============================================
- Hits           6198     3406    -2792     
+ Misses         5761     2257    -3504     
+ Partials        444      259     -185

Impacted Files	Coverage Δ	Complexity Δ
.../foundation/internals/NetworkInterfaceManager.java	61.01% <ø> (+0.36%)	11 <0> (ø)	⬇️
...ework/apollo/portal/controller/ItemController.java
...o/configservice/wrapper/DeferredResultWrapper.java
...omponent/emailbuilder/GrayPublishEmailBuilder.java
...k/apollo/portal/controller/FavoriteController.java
...apollo/portal/entity/vo/AppRolesAssignedUsers.java
...ponent/emailbuilder/NormalPublishEmailBuilder.java
.../framework/apollo/portal/entity/vo/SystemInfo.java
...rk/apollo/portal/service/NamespaceLockService.java
...k/apollo/portal/spi/ctrip/CtripUserInfoHolder.java
... and 200 more

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