add a new tunable : DeterministicIPs that makes the allocation of

add a new tunable : DeterministicIPs  that makes the allocation of
public addresses to nodes deterministic.

Activate it by adding CTDB_SET_DeterministicIPs=1 in /etc/sysconfig/ctdb

When this is set,    the first entry in /etc/ctdb/public_addresses will
always be hosted by node 0, when that node is available, the second
entry by node1 and so on.

This tunable allows the allocation of addresses to become very
unbalanced and is only for debugging/testing use.
Beware, this feature requires that /etc/ctdb/public_addresses are
identical on all the nodes in the cluster.