[RELEASE] Released version 3.1-dev8

[RELEASE] Released version 3.1-dev8

Released version 3.1-dev8 with the following main changes :
    - DOC: configuration: place the HAPROXY_HTTP_LOG_FMT example on the correct line
    - MINOR: mux-h1: Set EOI on SE during demux when both side are in DONE state
    - BUG/MEDIUM: mux-h1/mux-h2: Reject upgrades with payload on H2 side only
    - REGTESTS: h1/h2: Update script testing H1/H2 protocol upgrades
    - BUG/MEDIUM: clock: detect and cover jumps during execution
    - BUG/MINOR: pattern: prevent const sample from being tampered in pat_match_beg()
    - BUG/MEDIUM: pattern: prevent uninitialized reads in pat_match_{str,beg}
    - BUG/MEDIUM: pattern: prevent UAF on reused pattern expr
    - MEDIUM: ssl/cli: "dump ssl cert" allow to dump a certificate in PEM format
    - BUG/MAJOR: mux-h1: Wake SC to perform 0-copy forwarding in CLOSING state
    - BUG/MINOR: h1-htx: Don't flag response as bodyless when a tunnel is established
    - REGTESTS: fix random failures with wrong_ip_port_logging.vtc under load
    - BUG/MINOR: pattern: do not leave a leading comma on "set" error messages
    - REGTESTS: shorten a bit the delay for the h1/h2 upgrade test
    - MINOR: server: allow init-state for dynamic servers
    - DOC: server: document what to check for when adding new server keywords
    - MEDIUM: h1: Accept invalid T-E values with accept-invalid-http-response option
    - BUG/MINOR: polling: fix time reporting when using busy polling
    - BUG/MINOR: clock: make time jump corrections a bit more accurate
    - BUG/MINOR: clock: validate that now_offset still applies to the current date
    - BUG/MEDIUM: queue: implement a flag to check for the dequeuing
    - OPTIM: sample: don't check casts for samples of same type
    - OPTIM: vars: remove the unneeded lock in vars_prune_*
    - OPTIM: vars: inline vars_prune() to avoid many calls
    - MINOR: vars: remove the emptiness tests in callers before pruning
    - IMPORT: import cebtree (compact elastic binary trees)
    - OPTIM: vars: use a cebtree instead of a list for variable names
    - OPTIM: vars: use multiple name heads in the vars struct
    - BUG/MINOR: peers: local entries updates may not be advertised after resync
    - DOC: config: Explicitly list relaxing rules for accept-invalid-http-* options
    - MINOR: proxy: Rename accept-invalid-http-* options
    - DOC: configuration: Remove dangerous directives from the proxy matrix
    - BUG/MEDIUM: sc_strm/applet: Wake applet after a successfull synchronous send
    - BUG/MEDIUM: cache/stats: Wait to have the request before sending the response
    - BUG/MEDIUM: promex: Wait to have the request before sending the response
    - MINOR: clock: test all clock_gettime() return values
    - MEDIUM: clock: collect the monotonic time in clock_local_update_date()
    - MEDIUM: clock: opportunistically use CLOCK_MONOTONIC for the internal time
    - MEDIUM: clock: use the monotonic clock for idle time calculation
    - MEDIUM: clock: don't compute before_poll when using monotonic clock
    - BUG/MINOR: fix missing "log-format overrides previous 'option tcplog clf'..." detection
    - BUG/MINOR: fix missing "'option httpslog' overrides previous 'option tcplog clf'..." detection
    - BUG/MINOR: cfgparse-listen: fix option httpslog override warning message
    - BUG/MINOR: cfgparse: detect incorrect overlap of same backend names
    - MEDIUM: cfgparse: warn about proxies having the same names
    - DOC: management: add init-state to add server keywords
    - BUG/MINOR: mux-quic: report glitches to session
    - BUILD: cebtree: silence a bogus gcc warning on impossible code paths
    - MEDIUM: cfgparse: warn about colliding names between defaults and proxies
    - MEDIUM: cfgparse: detect collisions between defaults and log-forward