Add multipath to cinder-volume

Cinder-volume container can operate on multipath devices but
fails to do so due to absent multipath package for several images.
This fix explicitely adds multipath to the image.

Closes-Bug: #1970541
Change-Id: I14af40078508b06e46866b77ab200228ec827a0d
(cherry picked from commit b9aa913)

Author: vlad-belogrudov

docker/cinder/cinder-volume/Dockerfile.j2

@@ -9,6 +9,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% if base_package_type == 'rpm' %}
     {% set cinder_volume_packages = [
+            'device-mapper-multipath',
             'nfs-utils',
             'nvmetcli',
             'sysfsutils',
@@ -23,6 +24,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% elif base_package_type == 'deb' %}
     {% set cinder_volume_packages = [
             'lsscsi',
+            'multipath-tools',
             'nfs-common',
             'nvme-cli',
             'sysfsutils',