[RELEASE] Released version 2.3-dev7

Released version 2.3-dev7 with the following main changes :
    - CI: travis-ci: replace not defined SSL_LIB, SSL_INC for BotringSSL builds
    - BUG/MINOR: init: only keep rlim_fd_cur if max is unlimited
    - BUG/MINOR: mux-h2: do not stop outgoing connections on stopping
    - MINOR: fd: report an error message when failing initial allocations
    - MINOR: proto-tcp: make use of connect(AF_UNSPEC) for the pause
    - MINOR: sock: add sock_accept_conn() to test a listening socket
    - MINOR: protocol: make proto_tcp & proto_uxst report listening sockets
    - MINOR: sockpair: implement the .rx_listening function
    - CLEANUP: tcp: make use of sock_accept_conn() where relevant
    - CLEANUP: unix: make use of sock_accept_conn() where relevant
    - BUG/MINOR: listener: detect and handle shared sockets stopped in other processes
    - CONTRIB: tcploop: implement a disconnect operation 'D'
    - CLEANUP: protocol: intitialize all of the sockaddr when disconnecting
    - BUG/MEDIUM: deinit: check fdtab before fdtab[fd].owner
    - BUG/MINOR: connection: fix loop iter on connection takeover
    - BUG/MEDIUM: connection: fix srv idle count on conn takeover
    - MINOR: connection: improve list api usage
    - MINOR: mux/connection: add a new mux flag for HOL risk
    - MINOR: connection: don't check priv flag on free
    - MEDIUM: backend: add new conn to session if mux marked as HOL blocking
    - MEDIUM: backend: add reused conn to sess if mux marked as HOL blocking
    - MEDIUM: h2: remove conn from session on detach
    - MEDIUM: fcgi: remove conn from session on detach
    - DOC: Describe reuse safe for HOL handling
    - MEDIUM: proxy: remove obsolete "mode health"
    - MEDIUM: proxy: remove obsolete "monitor-net"
    - CLEANUP: protocol: remove the ->drain() function
    - CLEANUP: fd: finally get rid of fd_done_recv()
    - MINOR: connection: make sockaddr_alloc() take the address to be copied
    - MEDIUM: listener: allocate the connection before queuing a new connection
    - MINOR: session: simplify error path in session_accept_fd()
    - MINOR: connection: add new error codes for accept_conn()
    - MINOR: sock: rename sock_accept_conn() to sock_accepting_conn()
    - MINOR: protocol: add a new function accept_conn()
    - MINOR: sock: implement sock_accept_conn() to accept a connection
    - MINOR: sockpair: implement sockpair_accept_conn() to accept a connection
    - MEDIUM: listener: use protocol->accept_conn() to accept a connection
    - MEDIUM: listener: remove the second pass of fd manipulation at the end
    - MINOR: protocol: add a default I/O callback and put it into the receiver
    - MINOR: log: set the UDP receiver's I/O handler in the receiver
    - MINOR: protocol: register the receiver's I/O handler and not the protocol's
    - CLEANUP: protocol: remove the now unused <handler> field of proto_fam->bind()
    - DOC: improve the documentation for "option nolinger"
    - BUG/MEDIUM: proxy: properly stop backends
    - BUG/MEDIUM: task: bound the number of tasks picked from the wait queue at once
    - MINOR: threads: augment rwlock debugging stats to report seek lock stats
    - MINOR: threads: add the transitions to/from the seek state
    - MEDIUM: task: use an upgradable seek lock when scanning the wait queue
    - BUILD: listener: avoir a build warning when threads are disabled
    - BUG/MINOR: peers: Possible unexpected peer seesion reset after collisions.
    - MINOR: ssl: add volatile flags to ssl samples
    - MEDIUM: backend: reuse connection if using a static sni
    - BUG/MEDIUM: spoe: Unset variable instead of set it if no data provided
    - BUG/MEDIUM: mux-h1: Get the session from the H1S when capturing bad messages
    - BUG/MEDIUM: lb: Always lock the server when calling server_{take,drop}_conn
    - DOC: fix typo in MAX_SESS_STKCTR
diff --git a/VERSION b/VERSION
index beccda9..4cdd96e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3-dev6
+2.3-dev7