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This change implements CentOS7 and Ubuntu 16.04 support for the HAProxy role. Because RHEL does not package HATop the installation of HATop has been moved to a source installation so that it can be used universally. Implements: blueprint multi-platform-host Change-Id: Ib4f33185202b694b9611cc5fd6323c30a1c8d489 Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>