r10k: Replace removed env parameters by options
r10k: Replace removed env parameters by options

The environment parameters, PUPPETFILE_DIR and PUPPETFILE is no longer
valid in r10k command, so should be replaced by options, --moduledir
and --puppetfile[1].

[1] https://github.com/puppetlabs/r10k/commit/ea477d4729a7895e5f7d4ae4a41ac0f8f0eda1c9

Change-Id: I0d12f2c4efafc7a8a998d846814c94eb39927c26

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