Merge branch 'branch-0.5.0' into 'branch-0.5.0'

refine code

See merge request megasearch/milvus!669

Former-commit-id: 4ecbdddecd7ebe750050d722c2304b86130a4365

cpp/coverage.sh

@@ -104,7 +104,7 @@ ${LCOV_CMD} -r "${FILE_INFO_OUTPUT}" -o "${FILE_INFO_OUTPUT_NEW}" \
     "src/metrics/MetricBase.h"\
     "src/server/Server.cpp"\
     "src/server/DBWrapper.cpp"\
-    "src/server/grpc_impl/GrpcMilvusServer.cpp"\
+    "src/server/grpc_impl/GrpcServer.cpp"\
     "src/utils/easylogging++.h"\
     "src/utils/easylogging++.cc"\