setup.cfg: fix warning from setuptools wrt sambacc.grpc.protobufs

Fixes: #160

While it's not strictly necessary to make the protobuf file(s) part of
the python library because we generate the code ahead of time this
silences a warning from setuptools as well as making the file part
of the library, so it's distributed along with the code - which could
possibly be helpful in some situations. And it will be consistent with
our plans for varlink interface files, which do *need* to be part of
the library.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

sambacc/grpc/protobufs/__init__.py

@@ -21,6 +21,7 @@ packages =
     sambacc.schema
     sambacc.grpc
     sambacc.grpc.generated
+    sambacc.grpc.protobufs
     sambacc.commands.remotecontrol
 include_package_data = True