refactor: remove unused proxy settings file

This task file was orphaned in https://review.openstack.org/515397
and the functionality moved into tasks/main.yml so the task file
is no longer required.

Change-Id: I340df6b660f9d647eedd437f7ccce9060c3f5316

tasks/openstack_proxy_settings.yml

@@ -1,22 +0,0 @@
----
-# Copyright 2015, Rackspace US, Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-- name: Add global_environment_variables to environment file
-  blockinfile:
-    dest: "/etc/environment"
-    state: present
-    marker: "# {mark} Managed by OpenStack-Ansible"
-    insertbefore: EOF
-    block: "{{ lookup('template', 'environment.j2') }}"