This patch implements the use of the fail_over code under the control of
the data provider backend code. All providers share the same failover
structure and if they use the same service name, they also share the
same servers lists.
A set of callbacks is made available so that if a new resolution is
performed that changes the server currently in use then all providers
can update their status.
I have done limited testing with the ipa backend which exercises both
the ldap and krb code, although the standalone krb code still doesn't
implement using the failover code.
Simo.
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Simo Sorce * Red Hat, Inc * New York
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