## What is the purpose of the change
Fix the issue#1814. Support configuring dubbo.service.shutdown.wait /
dubbo.service.shutdown.wait.seconds in xml file.
## Brief changelog
Add SpringConfigUtils which invokes ConfigUtils and it's invoked in ServiceBean.
## Verifying this change
configuration sample:
```
<dubbo:application name="demo-provider">
<dubbo:parameter key="dubbo.service.shutdown.wait" value="15000"/>
</dubbo:application>
```
It's loaded into `ApplicationConfig.parameters` and set to
`ConfigUtils.properties`, the gracefulShutdown method use the property in
`ConfigUtils.properties`.
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[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/2381 ]
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