haproxy: Update to 2.0.7

2019/09/27 : 2.0.7
    - BUG/MEDIUM: stick-table: Properly handle "show table" with a data type argument
    - BUG/MINOR: mux-h2: Be sure to have a connection to unsubcribe
    - BUG/MAJOR: mux-h2: Handle HEADERS frames received after a RST_STREAM frame
    - BUG/MEDIUM: check/threads: make external checks run exclusively on thread 1
    - BUG/MINOR: stream-int: Process connection/CS errors first in si_cs_send()
    - BUG/MEDIUM: stream-int: Process connection/CS errors during synchronous sends
    - BUG/MEDIUM: checks: make sure the connection is ready before trying to recv
    - BUG/MINOR: mux-h2: do not wake up blocked streams before the mux is ready
    - BUG/MEDIUM: namespace: close open namespaces during soft shutdown
    - BUG/MEDIUM: mux-h2: don't reject valid frames on closed streams
    - BUG/MINOR: mux-h2: Use the dummy error when decoding headers for a closed stream
    - BUG/MAJOR: mux_h2: Don't consume more payload than received for skipped frames
    - BUG/MINOR: mux-h1: Do h2 upgrade only on the first request
    - BUG/MEDIUM: spoe: Use a different engine-id per process
    - MINOR: spoe: Improve generation of the engine-id
    - MINOR: spoe: Support the async mode with several threads
    - MINOR: stats: Add the support of float fields in stats
    - BUG/MINOR: contrib/prometheus-exporter: Return the time averages in seconds
    - DOC: Fix documentation about the cli command to get resolver stats
    - BUG/MEDIUM: namespace: fix fd leak in master-worker mode

(nia)