Rebalance failure due to replicator_died with memcached_error,auth_error,<<"Auth failure">>

failovertests.FailoverTests.test_failover_firewall,replica=3,load_ratio=10

1) We enable firewall on one of the nodes
2) Wait for it to be detected as failed
3) Click failover and rebalance it out.

Thus the problematic node cant be failed over

=========================CRASH REPORT=========================
crasher:
initial call: erlang:apply/2
pid: <0.7655.0>
registered_name: []
exception exit: {replicator_died,
{'EXIT',<16520.6161.0>,
{badmatch,
{memcached_error,auth_error,
<<"Auth failure">>}}}}
in function ns_replicas_builder:'build_replicas_main/6-fun-0'/1
in call from ns_replicas_builder:observe_wait_all_done_tail/5
in call from ns_replicas_builder:observe_wait_all_done/5
in call from ns_replicas_builder:'build_replicas_main/6-fun-1'/8
in call from ns_replicas_builder:try_with_maybe_ignorant_after/2
in call from ns_replicas_builder:build_replicas_main/6
ancestors: [<0.7654.0>,<0.7596.0>,<0.7534.0>]
messages: []
links: [<0.7654.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 121393
stack_size: 24
reductions: 17791
neighbours:

[ns_server:error] [2012-05-11 12:05:39] [ns_1@10.1.3.50:<0.7654.0>:ns_replicas_builder:try_with_maybe_ignorant_after:68] Eating exception from ignorant after-block:
{error,
{badmatch,
[{<0.7655.0>,
{replicator_died,
{'EXIT',<16520.6161.0>,
{badmatch,

{memcached_error,auth_error,<<"Auth failure">>}

}}}}]},
[

{ns_replicas_builder,sync_shutdown_many,1}

,

{ns_replicas_builder,try_with_maybe_ignorant_after,2}

,

{ns_single_vbucket_mover,mover,6}

,

{proc_lib,init_p_do_apply,3}

]}