Remove tasks for Ansible <= 2.3

The minimum version of ansible is 2.4, so these tasks are no longer
required.

Change-Id: Ied933d18e438955c23ad3eeff80e3377b5633a7c

ansible/roles/docker/tasks/main.yml

@@ -34,32 +34,11 @@
 # pick up the group membership. We do this by removing the SSH ControlPersist
 # connection.
 
-# NOTE: This method does not work in Ansible 2.3, which uses a SHA1 hash of the
-# connection parameters to determine the control persist socket path.
-- name: Drop the persistent SSH connection to activate the new group membership
-  local_action:
-    module: shell ssh -O stop {{ cp_hostname }} -o ControlPath={{ cp_path }}
-  register: socket_removal
-  failed_when:
-    - socket_removal|failed
-    - "'No such file or directory' not in socket_removal.stderr"
-  with_items: "{{ play_hosts }}"
-  run_once: True
-  when:
-    - group_result|changed
-    - ansible_version | version_compare('2.3', 'lt')
-  vars:
-    cp_hostname: "{{ hostvars[item].ansible_host|default(inventory_hostname) }}"
-    cp_username: "{{ hostvars[item].ansible_user }}"
-    cp_port: "{{ hostvars[item].ansible_ssh_port|default('22') }}"
-    cp_path: "~/.ansible/cp/ansible-ssh-{{ cp_hostname }}-{{ cp_port }}-{{ cp_username }}"
-
-# NOTE: For Ansible 2.3+, ideally we'd use a meta task with the
-# reset_connection option but due to
-# https://github.com/ansible/ansible/issues/27520 this does not work (checked
-# in Ansible 2.3.2.0). Instead, we use the heavy handed method of removing all
-# ansible control sockets. Limitation: if this user is running another ansible
-# process, we will kill its connections.
+# NOTE: Ideally we'd use a meta task with the reset_connection option but due
+# to https://github.com/ansible/ansible/issues/27520 this does not work
+# (checked in Ansible 2.3.2.0). Instead, we use the heavy handed method of
+# removing all ansible control sockets. Limitation: if this user is running
+# another ansible process, we will kill its connections.
 - name: Find persistent SSH connection control sockets
   local_action:
     module: find
@@ -71,7 +50,6 @@
   run_once: True
   when:
     - group_result|changed
-    - ansible_version | version_compare('2.3', 'ge')
 
 - name: Drop all persistent SSH connections to activate the new group membership
   local_action:

ansible/roles/junos-switch/tasks/main.yml

@@ -1,29 +1,11 @@
 ---
-# NOTE: We are installing this into the system python packages because it does
-# not seem to be possible to use ansible_python_interpreter in combination with
-# delegate_to. This should be investigated in future as modification of system
-# packages via pip is not ideal.
-
-# For ansible 2.2, Juniper specific python packages are required.
-- name: Ensure python dependencies are installed
-  pip:
-    name: "{{ item }}"
-  delegate_to: "{{ junos_switch_delegate_to }}"
-  with_items:
-    - junos-eznc
-    - jxmlease
-  when: ansible_version | version_compare('2.3', 'lt')
-  become: True
-
-# For ansible 2.3+, only the NETCONF client ncclient is required. This must be
-# installed on the Ansible control host where the ansible-connection subprocess
-# is executed.
+# The NETCONF client ncclient is required. This must be installed on the
+# Ansible control host where the ansible-connection subprocess is executed.
 - name: Ensure python dependencies are installed
   local_action:
     module: pip
     name: ncclient
     virtualenv: "{{ lookup('env', 'VIRTUAL_ENV') | default(omit, true) }}"
-  when: ansible_version | version_compare('2.3', 'ge')
   become: "{{ lookup('env', 'VIRTUAL_ENV') == None }}"
 
 - name: Ensure Juniper switches are configured