DOC: update roadmap with completed tasks

Server-side unix and half-closed timeouts are now done.
MEDIUM: session: implement half-closed timeouts (client-fin and server-fin)

Long-lived sessions are often subject to half-closed sessions resulting in
a lot of sessions appearing in FIN_WAIT state in the system tables, and no
way for haproxy to get rid of them. This typically happens because clients
suddenly disconnect without sending any packet (eg: FIN or RST was lost in
the path), and while the server detects this using an applicative heart
beat, haproxy does not close the connection.

This patch adds two new timeouts : "timeout client-fin" and
"timeout server-fin". The former allows one to override the client-facing
timeout when a FIN has been received or sent. The latter does the same for
server-facing connections, which is less useful.
[RELEASE] Released version 1.5-dev25

Released version 1.5-dev25 with the following main changes :
    - MEDIUM: connection: Implement and extented PROXY Protocol V2
    - MINOR: ssl: clean unused ACLs declarations
    - MINOR: ssl: adds fetchs and ACLs for ssl back connection.
    - MINOR: ssl: merge client's and frontend's certificate functions.
    - MINOR: ssl: adds ssl_f_sha1 fetch to return frontend's certificate fingerprint
    - MINOR: ssl: adds sample converter base64 for binary type.
    - MINOR: ssl: convert to binary ssl_fc_unique_id and ssl_bc_unique_id.
    - BUG/MAJOR: ssl: Fallback to private session cache if current lock mode is not supported.
    - MAJOR: ssl: Change default locks on ssl session cache.
    - BUG/MINOR: chunk: Fix function chunk_strcmp and chunk_strcasecmp match a substring.
    - MINOR: ssl: add global statement tune.ssl.force-private-cache.
    - MINOR: ssl: remove fallback to SSL session private cache if lock init fails.
    - BUG/MEDIUM: patterns: last fix was still not enough
    - MINOR: http: export the smp_fetch_cookie function
    - MINOR: http: generic pointer to rule argument
    - BUG/MEDIUM: pattern: a typo breaks automatic acl/map numbering
    - BUG/MAJOR: patterns: -i and -n are ignored for inlined patterns
    - BUG/MINOR: proxy: unsafe initialization of HTTP transaction when switching from TCP frontend
    - BUG/MINOR: http: log 407 in case of proxy auth
    - MINOR: http: rely on the message body parser to send 100-continue
    - MEDIUM: http: move reqadd after execution of http_request redirect
    - MEDIUM: http: jump to dedicated labels after http-request processing
    - BUG/MINOR: http: block rules forgot to increment the denied_req counter
    - BUG/MINOR: http: block rules forgot to increment the session's request counter
    - MEDIUM: http: move Connection header processing earlier
    - MEDIUM: http: remove even more of the spaghetti in the request path
    - MINOR: http: silently support the "block" action for http-request
    - CLEANUP: proxy: rename "block_cond" to "block_rules"
    - MEDIUM: http: emulate "block" rules using "http-request" rules
    - MINOR: http: remove the now unused loop over "block" rules
    - MEDIUM: http: factorize the "auth" action of http-request and stats
    - MEDIUM: http: make http-request rules processing return a verdict instead of a rule
    - MINOR: config: add minimum support for emitting warnings only once
    - MEDIUM: config: inform the user about the deprecatedness of "block" rules
    - MEDIUM: config: inform the user that "reqsetbe" is deprecated
    - MEDIUM: config: inform the user only once that "redispatch" is deprecated
    - MEDIUM: config: warn that '{cli,con,srv}timeout' are deprecated
    - BUG/MINOR: auth: fix wrong return type in pat_match_auth()
    - BUILD: config: remove a warning with clang
    - BUG/MAJOR: http: connection setup may stall on balance url_param
    - BUG/MEDIUM: http/session: disable client-side expiration only after body
    - BUG/MEDIUM: http: correctly report request body timeouts
    - BUG/MEDIUM: http: disable server-side expiration until client has sent the body
    - MEDIUM: listener: make the accept function more robust against pauses
    - BUILD: syscalls: remove improper inline statement in front of syscalls
    - BUILD: ssl: SSL_CTX_set_msg_callback() needs openssl >= 0.9.7
    - BUG/MAJOR: session: recover the correct connection pointer in half-initialized sessions
    - DOC: add some explanation on the shared cache build options in the readme.
    - MEDIUM: proxy: only adjust the backend's bind-process when already set
    - MEDIUM: config: limit nbproc to the machine's word size
    - MEDIUM: config: check the bind-process settings according to nbproc
    - MEDIUM: listener: parse the new "process" bind keyword
    - MEDIUM: listener: inherit the process mask from the proxy
    - MAJOR: listener: only start listeners bound to the same processes
    - MINOR: config: only report a warning when stats sockets are bound to more than 1 process
    - CLEANUP: config: set the maxaccept value for peers listeners earlier
    - BUG/MINOR: backend: only match IPv4 addresses with RDP cookies
    - BUG/MINOR: checks: correctly configure the address family and protocol
    - MINOR: tools: split is_addr() and is_inet_addr()
    - MINOR: protocols: use is_inet_addr() when only INET addresses are desired
    - MEDIUM: unix: add preliminary support for connecting to servers over UNIX sockets
    - MEDIUM: checks: only complain about the missing port when the check uses TCP
    - MEDIUM: unix: implement support for Linux abstract namespace sockets
    - DOC: map_beg was missing from the table of map_* converters
    - DOC: ebtree: indicate that prefix insertion/lookup may be used with strings
    - MEDIUM: pattern: use ebtree's longest match to index/lookup string beginning
    - BUILD: remove the obsolete BSD and OSX makefiles
    - MEDIUM: unix: avoid a double connect probe when no data are sent
    - DOC: stop referencing the slow git repository in the README
    - BUILD: only build the systemd wrapper on Linux 2.6 and above
    - DOC: update roadmap with completed tasks
    - MEDIUM: session: implement half-closed timeouts (client-fin and server-fin)