Set fixture paths for unit tests
Set fixture paths for unit tests

This change defines manifest_dir and module_path expicitly in unit
tests so that modules installed under fixtures directory is properly
loaded.

Closes-Bug: #1930403
Change-Id: Ic6af657059b55368897b04e2f537bb0b60298b31

openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca