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Merge "Added plugins overview for Dev Guide"

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doc/source/devref/plugins.rst
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Pluggable mechanism Pluggable Provisioning Mechanism
=================== ================================
Savanna Pluggable Provisioning Mechanism aims to deploy Hadoop clusters and integrate them with 3rd party vendor Savanna could be integrated with 3rd party management tools like Apache Ambari
management tools like Cloudera Management Console, Hortonworks Ambari, Intel Hadoop Distribution and monitoring tools and Cloudera Management Console. The integration is achieved using plugin
like NagiOS, Zabbix, Ganglia. mechanism.
`Read full specification here <https://wiki.openstack.org/wiki/Savanna/PluggableProvisioning>`_. In short, responsibilities are divided between Savanna core and plugin as
follows. Savanna interacts with user and provisions infrastructure (VMs).
Plugin installs and configures Hadoop cluster on the VMs. Optionally Plugin
could deploy management and monitoring tools for the cluster. Savanna
provides plugin with utility methods to work with VMs.
A plugin must extend `savanna.plugins.provisioning:ProvisioningPluginBase`
class and implement all the required methods. Read :doc:`plugin.spi` for
details.
.. note:: The `instance` objects provided by Savanna have `remote` property which
could be used to work with VM. The `remote` is a context manager so you
Object model, flow and detailed description will be moved here once this functionality is checked into repository. can use it in `with instance.remote:` statements. The list of available
commands could be found in `savanna.utils.remote.InstanceInteropHelper`.
See Vanilla plugin source for usage examples.