BUG/MINOR: stats: Add missing agent stats on servers

Agent stats were lost during the stats refactoring performed in the 2.4 to
simplify the Prometheus exporter. stats_fill_sv_stats() function must fill
ST_F_AGENT_* and ST_F_LAST_AGT stats.

This patch should fix the issue #1331. It must be backported to 2.4.

(cherry picked from commit 59bab616498399a8306eff2905764c0ecccdaf70)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed