Enable weave upgrade from previous versions

Raise readiness probe initial time to 60 (was 30)

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

@@ -0,0 +1,39 @@
+- 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"