Review Request 69042: Enabled more constructors for master `RegistryOperation`.

[Benjamin Bannier]

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https://reviews.apache.org/r/69042/
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Review request for mesos, Benjamin Mahler and Chun-Hung Hsiao.


Repository: mesos


Description
-------

Since this class was explicitly declaring a constructor, no other
constructors such as copy or move constructors were generated.

This patch removes the custom constructor so all default constructors
are generated automatically. This e.g., enables move construction of
`RegistryOperation` values.


Diffs
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  src/master/registrar.hpp 4f7c7ce2b3dea9f19eae67494f9767dc1c61e121 


Diff: https://reviews.apache.org/r/69042/diff/1/


Testing
-------

`make check`

Without this patch a clang close to trunk would warn
```
../src/resource_provider/registrar.cpp:387:5: warning: explicitly defaulted 
move constructor is implicitly deleted [-Wdefaulted-function-deleted]
    AdaptedOperation(AdaptedOperation&&) = default;
    ^
../src/resource_provider/registrar.cpp:374:28: note: move constructor of 
'AdaptedOperation' is implicitly deleted because base class 
'master::RegistryOperation' has a deleted move constructor
  class AdaptedOperation : public master::RegistryOperation
                           ^
../src/master/registrar.hpp:45:27: note: copy constructor of 
'RegistryOperation' is implicitly deleted because base class 
'process::Promise<bool>' has an inaccessible copy constructor
class RegistryOperation : public process::Promise<bool>
                          ^
../src/resource_provider/registrar.cpp:389:23: warning: explicitly defaulted 
move assignment operator is implicitly deleted [-Wdefaulted-function-deleted]
    AdaptedOperation& operator=(AdaptedOperation&&) = default;
                      ^
../src/resource_provider/registrar.cpp:374:28: note: move assignment operator 
of 'AdaptedOperation' is implicitly deleted because base class 
'master::RegistryOperation' has a deleted move assignment operator
  class AdaptedOperation : public master::RegistryOperation
                           ^
../src/master/registrar.hpp:45:27: note: copy assignment operator of 
'RegistryOperation' is implicitly deleted because base class 
'process::Promise<bool>' has an inaccessible copy assignment operator
class RegistryOperation : public process::Promise<bool>
                          ^
2 warnings generated.
```

No warning is emitted with this patch.


Thanks,

Benjamin Bannier