Use btrfs-progs instead of btrfs-tools in functional tests
Use btrfs-progs instead of btrfs-tools in functional tests

btrfs-tools is deprecated and replaced by btrfs-progs on modern
debian derivative operating systems.

Change-Id: Iaf5fb24146b7203e879feccc7c96b0984b425d01

openstack/openstack-ansible-lxc_container_create,openstack/openstack-ansible-lxc_container_create