Allow backends to set a callback in the be_ctx that should be
invoked when the ID provider goes online.
This can be used to perform regular maintenance tasks that are
valid only when going online.
Specifically, we can use this to perform a deferred kinit on behalf of
the user when we go online. We can also use this to trigger a dynamic
DNS update for the IPA provider.
--
Stephen Gallagher
RHCE 804006346421761
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