Review Request 58916: Fixed a minor bug in setting the agent's `totalResources`.

[Michael Park]

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Review request for mesos and Jiang Yan Xu.


Repository: mesos


Description
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If the following branch is taken, `totalResources` would be set
to `resources.get()` which is not equal to `info.resources()`.

```cpp
  if (HookManager::hooksAvailable()) {
    info.mutable_resources()->CopyFrom(
        HookManager::slaveResourcesDecorator(info));
  }
```


Diffs
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  src/slave/slave.cpp 8b8078dbb656e9db2efa53cc4ec5bed2cc01d49a 


Diff: https://reviews.apache.org/r/58916/diff/1/


Testing
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`make check`


Thanks,

Michael Park