Fixed Sentinel support for hostnames (#10146)
Sentinel tries to resolve instances hostname to IP only during registration. It might be that the instance is unavailable during that time, such as leader crashed and failover took place. Yet, promoted replica must support: - Register leader, even if it fails to resolve its hostname during failover - Try later to resolve it, if instance is disconnected. Note that this condition also support ip-change of an instance. (cherry picked from commit 79f089bd)
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