Allow to collect HAProxy stats and log them in a file

Getting HAProxy stats about its backends and health will help when
we have issues with timeouts and the like.

Closes-Bug: #1803716
Change-Id: Ic787f4ac32bf53c4409d8fd058a976fbb552cb94

roles/collect-logs/tasks/collect.yml

@@ -8,6 +8,7 @@
         name:
           - gzip
           - rsync
+          - socat
           - tar
 
     - name: Prepare directory with extra logs
@@ -92,6 +93,13 @@
         nova list &> /var/log/extra/nova_list.txt;
         fi
 
+    - name: Get haproxy stats
+      shell: >
+        pgrep haproxy && \
+        test -S /var/lib/haproxy/stats && \
+        echo 'show info;show stat;show table' | socat /var/lib/haproxy/stats stdio &> /var/log/extra/haproxy-stats.txt || \
+        echo "No HAProxy or no socket on host" > /var/log/extra/haproxy-stats.txt
+
     - name: lsmod
       shell: "lsmod &> /var/log/extra/lsmod.txt"