A change to mempool https://github.com/ceph/ceph/pull/55696 has
exposed a use after free bug in crushtool during process exit
where dtors are being called to free up mempool data structures
at the same time that the ceph context service thread is trying
to update them.
This commit modifies crushtool's initialization to prevent
this (unneeded) thread from being created. See issue for more
details about why the thread was not terminiating.
Fixes: https://tracker.ceph.com/issues/71027 Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>