[RELEASE] Released version 2.6-dev7

Released version 2.6-dev7 with the following main changes :
    - BUILD: calltrace: fix wrong include when building with TRACE=1
    - MINOR: ssl: Use DH parameters defined in RFC7919 instead of hard coded ones
    - MEDIUM: ssl: Disable DHE ciphers by default
    - BUILD: ssl: Fix compilation with OpenSSL 1.0.2
    - MINOR: mux-quic: split xfer and STREAM frames build
    - REORG: quic: use a dedicated module for qc_stream_desc
    - MINOR: quic-stream: use distinct tree nodes for quic stream and qcs
    - MINOR: quic-stream: add qc field
    - MEDIUM: quic: implement multi-buffered Tx streams
    - MINOR: quic-stream: refactor ack management
    - MINOR: quic: limit total stream buffers per connection
    - MINOR: mux-quic: implement immediate send retry
    - MINOR: cfg-quic: define tune.quic.conn-buf-limit
    - MINOR: ssl: Add 'show ssl providers' cli command and providers list in -vv option
    - REGTESTS: ssl: Update error messages that changed with OpenSSLv3.1.0-dev
    - BUG/MEDIUM: quic: Possible crash with released mux
    - BUG/MINOR: mux-quic: unsubscribe on release
    - BUG/MINOR: mux-quic: handle null timeout
    - BUG/MEDIUM: logs: fix http-client's log srv initialization
    - BUG/MINOR: mux-quic: remove dead code in qcs_xfer_data()
    - DEV: stream: Fix conn-streams dump in full stream message
    - CLEANUP: conn-stream: Rename cs_conn_close() and cs_conn_drain_and_close()
    - CLEANUP: conn-stream: Rename cs_applet_release()
    - MINOR: conn-stream: Rely on endpoint shutdown flags to shutdown an applet
    - BUG/MINOR: cache: Disable cache if applet creation fails
    - BUG/MINOR: backend: Don't allow to change backend applet
    - BUG/MEDIUM: conn-stream: Set back CS to RDY state when the appctx is created
    - MINOR: stream: Don't needlessly detach server endpoint on early client abort
    - MINOR: conn-stream: Make cs_detach_* private and use cs_destroy() from outside
    - MINOR: init: add the pre-check callback
    - MEDIUM: httpclient: change the init sequence
    - MEDIUM: httpclient/ssl: verify required
    - MINOR: httpclient/mworker: disable in the master process
    - MEDIUM: httpclient/ssl: verify is configurable and disabled by default
    - BUG/MAJOR: connection: Never remove connection from idle lists outside the lock
    - BUG/MEDIUM: mux-quic: fix stalled POST requets
    - BUG/MINOR: mux-quic: fix POST with abortonclose
    - MINOR: task: add a new task_instant_wakeup() function
    - MEDIUM: queue: use tasklet_instant_wakeup() to wake tasks
    - DOC: remove my name from the config doc
4 files changed