LS-5226: Remove lightstep.proto

It isn't needed since ligthstep_carrier_pb2.py is already present.

Also added googleapis-common-protos to requirements.

And responded to PR feedback.

Author: frenchfrywpepper

Makefile

@@ -72,5 +72,4 @@ thrift:
 proto:
 	protoc --proto_path "$(PWD)/../googleapis:$(PWD)/../lightstep-tracer-common/" \
 		--python_out="$(PWD)/lightstep" \
-		lightstep.proto \
-		collector.proto
+		collector.proto

lightstep/lightstep_pb2.py

@@ -10,7 +10,8 @@
     install_requires=['thrift==0.10.0',
                       'jsonpickle',
                       'six',
-                      'basictracer>=2.2,<2.3'],
+                      'basictracer>=2.2,<2.3',
+                      'googleapis-common-protos==1.5.3'],
     tests_require=['pytest',
                    'sphinx',
                    'sphinx-epytext'],