replica install fails with domain level 1
when updating an replication agreement from a toplogy segment an incorrect default value was used for bindmethod.
Only attributes explicitely set in the segment should be applied.
At shutdown the server could crash because the plugin was called after it was stopped.
Reviewed-By: Petr Vobornik <email@example.com>
Reviewed-By: Thierry Bordaz <firstname.lastname@example.org>