Patch overlooked strings from Python un-namespacing

src/python/grpcio_health_checking/MANIFEST.in

 include grpc_version.py
 include health_commands.py
-graft grpc
+graft grpc_health
 global-exclude *.pyc

tools/distrib/python/grpcio_tools/MANIFEST.in

@@ -2,6 +2,6 @@ include grpc_version.py
 include protoc_deps.py
 include protoc_lib_deps.py
 include README.rst
-graft grpc
+graft grpc_tools
 graft grpc_root
 graft third_party

tools/distrib/python/grpcio_tools/grpc_tools/command.py

@@ -45,7 +45,7 @@ def build_package_protos(package_root):
 
   for proto_file in proto_files:
     command = [
-        'grpc.tools.protoc',
+        'grpc_tools.protoc',
         '--proto_path={}'.format(inclusion_root),
         '--python_out={}'.format(inclusion_root),
         '--grpc_python_out={}'.format(inclusion_root),

tools/distrib/python/grpcio_tools/grpc_tools/protoc.py

@@ -45,5 +45,5 @@ def main(command_arguments):
   return _protoc_compiler.run_main(command_arguments)
 
 if __name__ == '__main__':
-  proto_include = pkg_resources.resource_filename('grpc.tools', '_proto')
+  proto_include = pkg_resources.resource_filename('grpc_tools', '_proto')
   sys.exit(main(sys.argv + ['-I{}'.format(proto_include)]))