[HDP] Only one ZOOKEEPER server is allowed in a cluster

[John Speidel]

The HDP plugin doesn't allow more than one ZOOKEEPER server in a cluster topology.
This restriction is incorrect in that multiple ZOOKEEPER servers should be allowed.
This restriction occurs in services.ZookeeperService.validate().

In addition to removing this restriction, token replacement for several zookeeper related configuration properties needs to be fixed. Currently, the token %ZOOKEEPER_HOST% is replaced with a single ZK server. If multiple ZK servers exist in the cluster the token should be replaced with a comma delimited list of ZK servers. Also, the token name should be changed to the plural %ZOOKEEPER_HOSTS%.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/121271

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/121271
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=ff035be458df350fc3ce5c7e04736734ced636cf
Submitter: Jenkins
Branch: master

commit ff035be458df350fc3ce5c7e04736734ced636cf
Author: Michael McCune <email address hidden>
Date: Fri Sep 12 12:08:58 2014 -0400

    Refactoring HDP plugins to allow multiple Zookeeper servers

    These changes are reflected in both the 1.3.2 and 2.0.6 versions of the
    HDP plugin.

    Changes
    * fixing tests
    * changing default cluster templates to allow multiple zookeeper servers
    * changing zookeeper validations to allow multiple servers

    Closes-Bug: #1260835
    Change-Id: I5645db95ad3cb44e1d9e5db32c996280ba2d820a