mtail: remove dead code

roles/mtail/tasks/pre.yaml

@@ -1,42 +1,4 @@
 ---
-#- name: determine if installed
-#  stat:
-#    path: "{{ mtail_bin_path }}/mtail"
-#  register: st
-#
-#- name: set mtail_installed
-#  set_fact:
-#    mtail_installed: "{{ st.stat.exists | bool }}"
-#
-#- block:
-#  - name: determine latest version
-#    uri:
-#      url: https://api.github.com/repos/google/mtail/releases/latest
-#      return_content: true
-#      body_format: json
-#    register: _latest_version
-#    until: _latest_version.status == 200
-#    retries: 3
-#
-#  - name: set mtail_version
-#    set_fact:
-#      mtail_version: "{{ _latest_version.json['tag_name'] | regex_replace('^v', '') }}"
-#
-#- block:
-#  - name: determine installed version
-#    command: "{{ mtail_bin_path }}/mtail --version"
-#    register: _installed_version_string
-#    changed_when: false
-#
-#  - name: set mtail_local_version
-#    set_fact:
-#      mtail_local_version: "{{ _installed_version_string.stdout | regex_search(mtail_version_regex, '\\1') | first }}"
-#  when: mtail_installed
-#
-#- name: set mtail_local_version to 0
-#  set_fact:
-#    mtail_local_version: "0"
-#  when: not mtail_installed
 - name: determine if installed
   stat:
     path: "{{ mtail_bin_path }}/mtail"