Add infrastructure to copy common-rst translations
Add infrastructure to copy common-rst translations

This adds the scripting framework to copy over translations of the
common-rst directory to the synced repositories.

Right now only security-guide repository is synced this way.
Other repos are not ready yet.

Change-Id: I467a32c15dba2ffc16b3f6bdb38cddae9e631980

kairoaraujo/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals