Move ServerLoad off the heartbeat; prereq of hbase-1502
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Key: HBASE-3574
URL: https://issues.apache.org/jira/browse/HBASE-3574
Project: HBase
Issue Type: Task
Reporter: stack
The master ui and shell report on cluster load by reading the serverload
delivered by each RS on heartbeat. HBASE-1502 is removing heartbeat. Need to
do serverload otherwise. I'm thinking of writing it instead into the RS
ephemeral node and having the master UI, etc. read it from zk instead.
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