Restart docker after changing storage driver
Restart docker after changing storage driver

This likely explains why CI appears to still be running the
devicemapper driver even though overlay2 is now the default.

Change-Id: Ic2d80bae1fddbdb1c80bae297031521dd78d896a
Closes-Bug: #1692502

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo