Purge old upgrade hooks and unused tasks (#1641)

roles/network_plugin/weave/tasks/main.yml

@@ -1,6 +1,4 @@
 ---
-- include: pre-upgrade.yml
-
 - include: seed.yml
   when: weave_mode_seed
 

roles/network_plugin/weave/tasks/pre-upgrade.yml

@@ -1,42 +0,0 @@
----
-- name: Weave pre-upgrade | Stop legacy weave
-  command: weave stop
-  failed_when: false
-
-- name: Weave pre-upgrade | Stop legacy systemd weave services
-  service:
-    name: "{{ item }}"
-    enabled: no
-    state: stopped
-  with_items:
-    - weaveexpose
-    - weaveproxy
-    - weave
-  failed_when: false
-
-- name: Weave pre-upgrade | Purge legacy systemd weave systemd unit files
-  file:
-    path: "{{ item }}"
-    state: absent
-  register: purged_weave_systemd_units
-  with_items:
-    - "/etc/systemd/system/weaveexpose.service"
-    - "/etc/systemd/system/weaveproxy.service"
-    - "/etc/systemd/system/weave.service"
-
-- name: Weave pre-upgrade | Reload systemd
-  command: systemctl daemon-reload
-  when: ansible_service_mgr == "systemd" and purged_weave_systemd_units.changed
-
-- name: Weave pre-upgrade | Purge legacy weave configs and binary
-  file:
-    path: "{{ item }}"
-    state: absent
-  with_items:
-    - "{{ bin_dir }}/weave"
-    - "/etc/weave.env"
-
-- name: Weave pre-upgrade | Purge legacy weave docker containers
-  shell: "docker ps -af 'name=^/weave.*' -q | xargs --no-run-if-empty docker rm -f"
-  retries: 3
-  failed_when: false