Update java generator.
Update java generator.

- Add a "package" argument so it can be used for packages other than tensorflow.
- Use [-subpackages](https://docs.oracle.com/javase/7/docs/technotes/tools/solaris/javadoc.html) arg to make generaion recursive.
- Merge bazel generated op-source so ops docs are generated.

$> tree /tmp/gen_java

org/
└── tensorflow
    ├── DataType.html
    ├── EagerSession.DevicePlacementPolicy.html
    ├── EagerSession.html
    ├── EagerSession.Options.html
    ├── EagerSession.ResourceCleanupStrategy.html
    ├── examples
    │   ├── LabelImage.html
    │   └── package-summary.html
    ├── ExecutionEnvironment.html
    ├── Graph.html
    ├── GraphOperationBuilder.html
    ├── GraphOperation.html
    ├── Graph.WhileSubgraphBuilder.html
    ├── op
    │   ├── annotation
    │   │   ├── Operator.html
    │   │   └── package-summary.html
    │   ├── core
    │   │   ├── Abort.html
    │   │   ├── Abort.Options.html
    │   │   ├── All.html
    │   │   ├── All.Options.html
    │   │   ├── AllToAll.html
    │   │   ├── AnonymousIteratorV2.html
    │   │   ├── AnonymousMemoryCache.html
    │   │   ├── AnonymousMultiDeviceIterator.html
    │   │   ├── AnonymousRandomSeedGenerator.html
    │   │   ├── AnonymousSeedGenerator.html
    │   │   ├── Any.html
    │   │   ├── Any.Options.html
    │   │   ├── ApplyAdagradV2.html
    │   │   ├── ApplyAdagradV2.Options.html
    │   │   ├── AssertCardinalityDataset.html
    │   │   ├── AssertNextDataset.html
    │   │   ├── AssertThat.html
    │   │   ├── AssertThat.Options.html
   ...

PiperOrigin-RevId: 308898353
Change-Id: Idedd2283d205ae08d32c3dc48b3ec5adb6c15ac4

freedomtan/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,frreiss/tensorflow-fred,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,aldian/tensorflow,karllessard/tensorflow,annarev/tensorflow,petewarden/tensorflow,davidzchen/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,paolodedios/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,annarev/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,aam-at/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,frreiss/tensorflow-fred,sarvex/tensorflow,karllessard/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,petewarden/tensorflow,Intel-Corporation/tensorflow,karllessard/tensorflow,annarev/tensorflow,gautam1858/tensorflow,aldian/tensorflow,aam-at/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,cxxgtxy/tensorflow,aldian/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,davidzchen/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,sarvex/tensorflow,yongtang/tensorflow,annarev/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,paolodedios/tensorflow,sarvex/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,yongtang/tensorflow,petewarden/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,cxxgtxy/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,aam-at/tensorflow,karllessard/tensorflow,petewarden/tensorflow,Intel-Corporation/tensorflow,aldian/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,gautam1858/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,aldian/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,petewarden/tensorflow,sarvex/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,petewarden/tensorflow,karllessard/tensorflow,freedomtan/tensorflow,Intel-Corporation/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,aam-at/tensorflow,tensorflow/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,aam-at/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,gautam1858/tensorflow,annarev/tensorflow,petewarden/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,davidzchen/tensorflow,freedomtan/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,aldian/tensorflow,yongtang/tensorflow,aam-at/tensorflow,yongtang/tensorflow