Since version 2.2, HAProxy is able to update dynamically certificates,
without a reload.
This patch uses socat to push the certificate into HAProxy in order to
achieve hot update. With this method, reloading is not required.
This should be used only to update an existing certificate in haproxy.
2 new variables are available:
- DEPLOY_HAPROXY_HOT_UPDATE="yes" update over the stats socket instead
of reloading
- DEPLOY_HAPROXY_STATS_SOCKET="UNIX:/run/haproxy/admin.sock" set the path on
the stats socket.
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