1. Changes in HPACK decoder to copy only Huffman-decoded and dynamically indexed headers;
2. Appropriate changes in HPACK-decoder/parser unit-tests.

…lity (#309).

…O' comments (#309).

Corrections as a result of HPACK decoder/encoder/parser unit-tests debugging.

…tion flow (#309).

…lts (#309).

…tion (#309).

TfwStrs often go in arrays, and there is a 1-byte alignment gap between
TfwStr neighbours. `eolen` is always [0,2], 14-bits are enough for
hpack index.

# Conflicts:
#	tempesta_fw/http_parser.c
#	tempesta_fw/http_sess.c
#	tempesta_fw/t/unit/test_hpack.c
#	tempesta_fw/t/unit/test_http_sticky.c

…ve duplication conflicts

…file is used in the source tree

Cleanups for #1368

Main changes:
1. Keep h_tbl always valid since we need to read the table during
   response caching.
2. Optimize header alteration for h2, use compatibility mode for http1.1
3. Use tfw_msg_write functions to take care of all possible caveats at
   message creation stage. (E.g. headers may be longer than one page)

Known issues:
1. Body and trailer conversion is not tested due to parsing issues:
   body is not appended to the request and WARN_ON is triggered.

When tfw_http_msg_grow_hdr_tbl() is called it relocates
the hm->ht, but all code around the call still uses the
previous pointer. Thus changes are written to previous table, not
current.

- Don't switch fsm state on processing DATA frame header, update the
fsm state only after the full DATA frame is processed. Otherwise the
fsm is triggered twice and fsm closes the connection when a new portion
of DATA frame is expected.
- The HTTP2_STREAM_REM_HALF_CLOSED flag is set when the h2 frames are
processed, this flag may be evalueted by http parser only when all the
data from current h2 frame is parsed

Body it skb list by itself, so a new function is required.

h2 recipient will reject frame if it's too big for it. Honor remote
peer settings when send messages, or fail fast otherwise, since the
connection will be closed anyway.

…renct additions of CRLF

… is broken

Don't switch fsm state on processing frame header, update the
fsm state only after the full frame is processed. Otherwise the
fsm is triggered twice and fsm closes the connection when a new
fragment of frame is expected.

Fix request h2 -> http1.1 conversion

Parse name, colon, LWS, value and RWS of HTTP/1.1-response headers into
separate chunks to facilitate the name/value splitting and colon/OWS
eviction during HTTP/1.1=>HTTP/2 response transformation.

…309).

…309).

A few review comment fixes for http2 parser

…om cache (#309).

…ion-h2-cache

HTTP/2 implementation: HTTP/2-cache (#309).