tasks/ceph_manager: ignore EACCES when waiting for quorum

tasks/ceph_manager: ignore EACCES when waiting for quorum

mon_tick_interval is 5 seconds by default. monitors update their
rotating keys every mon_tick_interval. before monitors forms a
quorum, the auth requests from clients are put into the wait list.
these requests are re-enqueued once the monitors form a quorum. but
there is a small window of mon_tick_interval, before they are able
to serve the auth requests even after their claim to be able to
server requests. if these re-enqueued requests happen to be served
in this window, and if authx is enabled, they will be greeted with
errors like

handle_auth_bad_method server allowed_methods [2] but i only support [2]

in the case of ceph cli, the error would look like:

[errno 13] RADOS permission denied (error connecting to the cluster)

so, to address this issue, the EACCES error is ignored when waiting
for a quorum.

Signed-off-by: Kefu Chai <kchai@redhat.com>