doc: update distro information and cloud-init users
- centralize the information about the default cloud-init users for various distributions to point to the existing specialized page; - remove all CentOS 6 and Ubuntu 12.04 (Precise) references, and do not refer to Ubuntu 14.04 for the vanilla plugin; - add Ubuntu 16.04 (Xenial) details when needed; - update the pointers to few packages. Change-Id: I4654e6ec2821bcec5207f41b93c5d0f0633ba18c
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@ -22,9 +22,8 @@ CDH 5.4.0 HDFS and Apache Spark installed.
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The Spark plugin requires an image to be tagged in the sahara image registry
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with two tags: 'spark' and '<Spark version>' (e.g. '1.6.0').
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Also you should specify the username of the default cloud-user used in the
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image. For the images available at the URLs listed above and for all the ones
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generated with the DIB it is `ubuntu`.
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The image requires a username. For more information, refer to the
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:doc:`registering-image` section.
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Note that the Spark cluster is deployed using the scripts available in the
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Spark distribution, which allow the user to start all services (master and
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