Corrected the task 'Get file_descriptors total_limit' to get the

'fs.file-max' value.

Closes-Bug: #1934656
Change-Id: I3a54abe72a68da04c57c05a71e4eace93225f058
(cherry picked from commit e610926e80)

roles/rabbitmq_limits/tasks/main.yml

@@ -10,7 +10,7 @@
   shell: >-
     "{{ container_cli }}"
     exec $("{{ container_cli }}" ps -q --filter "name=rabbitmq" | head -1)
-    rabbitmqctl eval 'sysctl -n fs.file-max'
+    sysctl -n fs.file-max
   changed_when: false
 
 - name: Verify the actual limit exceeds the minimal value