vstart.sh: disable "auth_allow_insecure_global_id_reclaim"

vstart.sh: disable "auth_allow_insecure_global_id_reclaim"

to silence the health warning of "mons are allowing insecure global_id
reclaim", which prevents the cluster from being active+clean. couple
tests are expecting a warning free cluster before they starts.

as this option is enabled by default for appeasing the old clients, but when it
comes to most of upstream testing, we can just disable it.

Fixes: https://tracker.ceph.com/issues/50374
Signed-off-by: Kefu Chai <kchai@redhat.com>