Heartbeat failure

[Alex Kramarov]

This thing just happened again, on another cluster, where i didn't increase
the deadtime before. But this failure depicts the scenario that i explained
:

w5 detects that w4 dies
w5 takes over the vip
w5 detects that w4 is back
w5 releases the vip

w4 doesn't detect that ANYTHING happened, so the traffic to the VIP still
flows to w5 !!!

THIS IS A VERY SERIOS BUG which results in denial of service until heartbeat
is manually restarted on w4, which can be simply resolved by having the
heartbeat that owns the vip send gracios arps from time to time ...
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