po: add rules for integration with zanata
po: add rules for integration with zanata

Add rules to handle pushing libvirt-glib.pot to zanata, and refreshing .po
files with new content from zanata.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-glib,libvirt/libvirt-glib,libvirt/libvirt-glib