[PATCH] Do not allow different versions of ctdb in a cluster

[Amitay Isaacs]

Hi,

Till now there has never been a check to ensure that compatible ctdb
versions are running in a cluster.  We allowed different versions of ctdb
in a cluster.  This patch set adds a check to ensure that a cluster has
compatible versions of ctdb.

As a general rule, ctdb with same major and minor versions will be
compatible.

However allow the flexibility of mixing versions if you know what you are
doing via new tunable AllowMixedVersions.

Please review and push.

These patches are dependent on the set of patches posted previously
(simplify generation of version header files in ctdb build).

Amitay.
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