The store_hint() method starts taking both an IP
and a host ID as its arguments. The rationale
for the change is depending on the stage of
the cluster (before an upgrade to the
host-ID-based hinted handdof and after it),
we might need to create a directory representing
either an IP address, or a host ID.
Because locator::topology can change in the
before obtaining the host ID we pass
and when the function is being executed,
we need to pass both parameters explicitly
to ensure the consistency between them.
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