workaround to run beaker with puppet4
workaround to run beaker with puppet4

When running Puppet4, the bin not in $PATH so beaker jobs fail to run
Puppet. Also we use SUDO in OpenStack Infra to run Beaker so we can use
PATH.
This patch is a workaround to make it possible.

Change-Id: Ie25a414f86d9d4b9d60e28d2680a13a503abad8b

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration