Remove "fetch_journal_log" role as it's not needed

We don't need to run that ansible role in the functional and fullstack
jobs as devstack already stores archive with journal log from the test
node.
It is available in the "devstack.journal.gz" file in logs.

Change-Id: Id527e7b5240240f5299a6f163bc124002c64fa18

playbooks/post_functional_job.yaml

@@ -1,5 +1,4 @@
 - hosts: all
   roles:
-    - fetch_journal_log
     - fetch-tox-output
     - fetch-subunit-output

roles/fetch_journal_log/README.rst

@@ -1,16 +0,0 @@
-Collect journal log from test run
-
-By default, this stores journal log into log file and store it in
-"journal_log_file_path"
-
-**Role Variables**
-
-.. zuul:rolevar:: journal_log_path
-   :default: {{ ansible_user_dir }}/workspace/logs
-
-   Path where journal log file will be stored on job's node.
-
-.. zuul:rolevar:: journal_log_file_name
-   :default: {{ journal_log_path }}/journal.log
-
-   Name of journal log file.

roles/fetch_journal_log/defaults/main.yaml

@@ -1,2 +0,0 @@
-journal_log_path: "{{ ansible_user_dir }}/logs"
-journal_log_file_name: "{{ journal_log_path }}/journal.log"

roles/fetch_journal_log/tasks/main.yaml

@@ -1,22 +0,0 @@
-- name: Ensure {{ journal_log_path }} exists
-  become: yes
-  file:
-    path: "{{ journal_log_path }}"
-    state: directory
-    owner: "{{ ansible_user }}"
-    group: "{{ ansible_user }}"
-    mode: 0775
-
-- name: Store journal logs in {{ journal_log_file_name }}
-  become: yes
-  shell:
-    cmd: |
-      /bin/journalctl -a > {{ journal_log_file_name }}
-
-- name: Set journal.log file permissions
-  become: yes
-  file:
-    path: '{{ journal_log_file_name }}'
-    owner: '{{ ansible_user }}'
-    group: '{{ ansible_user }}'
-    mode: 0644