add a parameter to turn off mongod journal
add a parameter to turn off mongod journal

closes: #68

Prophidys/puppet-openstack-cloud,Prophidys/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,Prophidys/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,goneri/puppet-openstack-cloud,goneri/puppet-openstack-cloud