qa/standalone/ceph-helpers: resurrect all OSD before waiting for health

qa/standalone/ceph-helpers: resurrect all OSD before waiting for health

address the regression introduced by e62cfceb
in e62cfceb, we wanted to test the newly introduced TOO_FEW_OSDS
warning, so we increased the number of OSD to the size of pool, so if
the number of OSD is less than pool size, monitor will send a warning
message.

but we need to bring all OSDs back if we are expecting a healthy
cluster. in this change, all OSDs are resurrect before
`wait_for_health_ok`.

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