totemconfig: Fix minimum limit for hold timeout

Make sure the retransmit timeout have the lowest limit
MINIMUM_TIMEOUT. So, the lowest limit of hold should be
recalculated.

Also token timeout and retransmits count should
keep a relational expression.

Signed-off-by: yuan ren <yren@suse.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>