Advertised header table size is not used

[maskit]

Current H2 implementation doesn't use the advertised header table size.

To reproduce:

$ nghttp -nv -c 1024 https://localhost/

This fails with COMPRESSION_ERROR.

Todo:

• Update internal maximum header table size with advertised size (SETTINGS_HEADER_TABLE_SIZE).
• Send "Dynamic Table Size Update" in the beginning of a header block

[maskit]

I'm working on it.