Add multipathing support to docker container

Due some cinder drivers need multipathing support like this one
http://docs.openstack.org/mitaka/config-reference/block-storage/drivers/ibm-storwize-svc-driver.html

This PS will allow to run these additional drivers when using Kolla.

Implements: blueprint multipath-support
Change-Id: Id6cf29f984c92773bbfc2f95daea573a74701648