plugin should "de-register" itself from master /etc/hosts when departing

Bug #1490634 reported by Kevin W Monroe on 2015-08-31
This bug affects 1 person
Affects Status Importance Assigned to Milestone
apache-hadoop-plugin (Juju Charms Collection)
Juju Big Data Development

Bug Description

1. juju deploy apache-hive hive
2. juju deploy apache-hadoop-plugin plugin
3. juju add-relation hive plugin
4. juju destroy-service hive
5. juju deploy apache-hive hive
6. juju add-relation hive plugin
7. juju ssh hive/0
8. cat /etc/hosts

You'll have an entry from 2 plugin units in /etc/hosts, even though the first one was killed with step 4. We should de-register the /etc/hosts entry from hdfs/yarn master KV unitdata when plugins go away. This probably affects compute-slave too.

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