Fix dcb variable in postinst
Fix dcb variable in postinst

Signed-off-by: Julien Danjou <5c682c2d1ec4073e277f9ba9f4bdf07e5794dabe@danjou.info>

sileht/deb-openstack-keystone,sileht/deb-openstack-keystone,sileht/deb-openstack-keystone