When hugepages are enabled, each custom NUMA node must be bound to a
single host node. This was checked with a regex that only accepts a
single digit, so any host node from 10 upwards was rejected with a
misleading "more than 1 hostnode value" error, making hugepages
unusable on hosts with more than ten NUMA nodes.
Accept any single node number instead. Ranges and lists are still
rejected as before.
Signed-off-by: Michal Fox <me@dualfroz.com>