Merge pull request #6320 from markdroth/limit_metadata_size

Makefile

include/grpc/impl/codegen/grpc_types.h

include/grpc/impl/codegen/slice_buffer.h

src/core/ext/transport/chttp2/transport/chttp2_transport.c

src/core/ext/transport/chttp2/transport/frame_rst_stream.c

src/core/ext/transport/chttp2/transport/incoming_metadata.c

src/core/ext/transport/chttp2/transport/incoming_metadata.h

src/core/ext/transport/chttp2/transport/internal.h

src/core/ext/transport/chttp2/transport/parsing.c

src/core/lib/iomgr/tcp_posix.c

src/core/lib/transport/metadata.h

src/core/lib/transport/metadata_batch.c

src/core/lib/transport/metadata_batch.h

test/core/bad_client/bad_client.c

test/core/bad_client/bad_client.h

test/core/bad_client/gen_build_yaml.py

test/core/bad_client/tests/badreq.c

test/core/bad_client/tests/connection_prefix.c

test/core/bad_client/tests/head_of_line_blocking.c

test/core/bad_client/tests/headers.c