Remove mention of haproxy-endpoints role

Role was never migrated to usage of haproxy-endpoints role
and included task was used instead the whole time.
With that to reduce complexity and to have unified approach, all mention
of the role and handler are removed from the code.

Change-Id: Ie397e5d28027341a3c3b67ea588dcce035121d19

handlers/main.yml

@@ -27,7 +27,3 @@
   listen:
     - "Restart uwsgi services"
     - "venv changed"
-
-- meta: noop
-  listen: Manage LB
-  when: false

tasks/uwsgi_install.yml

@@ -40,7 +40,6 @@
   retries: 5
   delay: 2
   notify:
-    - Manage LB
     - Restart uwsgi services
 
 - name: Install the python venv

tasks/uwsgi_post_install.yml

@@ -26,7 +26,6 @@
     config_overrides: "{{ item.value.uwsgi_overrides | default({}) | combine(uwsgi_ini_overrides, recursive=True) }}"
   with_dict: "{{ uwsgi_services }}"
   notify:
-    - Manage LB
     - Restart uwsgi services
 
 - name: Run the systemd service role