ipatests: fix test_topology
    
    The test TestTopologyOptions::test_add_remove_segment is
    randomly failing downstream. Test scenario:
    - create a line topology master <-> repl1 <-> repl2
    - create user on master
    - wait for repl success on master
    - check that the user is seen on repl2
    
    The test waits for replication to complete on the master but
    it should also wait for the replication to complete on repl1
    before checking the user presence on repl2.
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Anuja More <amore@redhat.com>