If mandos-client did not see TLS keys and had to create them, or if mandos sees GnuTLS version 3.6.6 or later, show an important notice on package installation about the importance of adding the new key_id options to clients.conf on the Mandos server.
* debian/control (Package: mandos, Package: mandos-client): Depend on debconf. * debian/mandos-client.lintian-overrides: Override warnings. * debian/mandos-client.postinst (create_keys): Show notice if new TLS key files were created. * debian/mandos-client.templates: New. * debian/mandos.lintian-overrides: Override warnings. * debian/mandos.postinst (configure): If GnuTLS 3.6.6 or later is detected, show an important notice (once) about the new key_id option required in clients.conf. * debian/mandos.templates: New.