修改openApi gson解析时间格式报异常问题。

[yaningxu]

open api报的解析错误时间格式不对：
xception: Unparseable date: "2019-07-17T19:31:43.686+0800"

Gson gson = (new GsonBuilder()).setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").create();

yyyy-MM-dd'T'HH:mm:ss.SSSZ（对）
yyyy-MM-dd'T'HH:mm:ssZ（错）

[codecov-io]

Codecov Report

Merging #2462 into master will increase coverage by 8.22%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2462      +/-   ##
============================================
+ Coverage     50.14%   58.37%   +8.22%     
+ Complexity     2039     1170     -869     
============================================
  Files           408      196     -212     
  Lines         12541     5943    -6598     
  Branches       1281      636     -645     
============================================
- Hits           6289     3469    -2820     
+ Misses         5804     2211    -3593     
+ Partials        448      263     -185

Impacted Files	Coverage Δ	Complexity Δ
.../portal/spi/configuration/LdapGroupProperties.java
...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 202 more

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[nobodyiam]

LGTM