Remove SKIP_LOG_SETUP env variable from fluentd env

SKIP_LOG_SETUP variable was used by Heka stuff.
Heka has been removed from Kolla and Kolla-ansible.

Change-Id: I4448b26ace899eb888d34a12a85b019597e25435

ansible/roles/common/defaults/main.yml

@@ -9,7 +9,6 @@ common_services:
     image: "{{ fluentd_image_full }}"
     environment:
       KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
-      SKIP_LOG_SETUP: "true"
     volumes:
       - "{{ node_config_directory }}/fluentd/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"