ceph-volume: Add PYTHONIOENCODING env variable

Since https://github.com/ceph/ceph/commit/77912c0 ceph-volume uses
stdout encoding based on LC_CTYPE and PYTHONIOENCODING environment
variables.
Thoses variables aren't set when using ansible.
Currently this commit breaks non containerized deployment on Ubuntu.

TASK [use ceph-volume to create bluestore osds] ********************
  cmd:
  - ceph-volume
  - --cluster
  - ceph
  - lvm
  - create
  - --bluestore
  - --data
  - /dev/sdb
  rc: 1
  stderr: |-
    Traceback (most recent call last):
    (...)
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in
    position 132: ordinal not in range(128)

Note that the task is failing on ansible side due to the stdout
decoding but the osd creation is successful.

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

roles/ceph-config/tasks/main.yml

@@ -37,6 +37,7 @@
       CEPH_VOLUME_DEBUG: 1
       CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else None }}"
       CEPH_CONTAINER_BINARY: "{{ container_binary }}"
+      PYTHONIOENCODING: utf-8
     when:
       - devices | default([]) | length > 0
       - osd_scenario == 'lvm'
@@ -57,6 +58,7 @@
       CEPH_VOLUME_DEBUG: 1
       CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else None }}"
       CEPH_CONTAINER_BINARY: "{{ container_binary }}"
+      PYTHONIOENCODING: utf-8
     when:
       - devices | default([]) | length > 0
       - osd_scenario == 'lvm'

roles/ceph-osd/tasks/scenarios/lvm-batch.yml

@@ -15,3 +15,4 @@
     CEPH_VOLUME_DEBUG: 1
     CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else None }}"
     CEPH_CONTAINER_BINARY: "{{ container_binary }}"
+    PYTHONIOENCODING: utf-8

roles/ceph-osd/tasks/scenarios/lvm.yml

@@ -18,5 +18,6 @@
     CEPH_VOLUME_DEBUG: 1
     CEPH_CONTAINER_IMAGE: "{{ ceph_docker_registry + '/' + ceph_docker_image + ':' + ceph_docker_image_tag if containerized_deployment else None }}"
     CEPH_CONTAINER_BINARY: "{{ container_binary }}"
+    PYTHONIOENCODING: utf-8
   with_items: "{{ lvm_volumes }}"
   tags: prepare_osd