CLI Integration Tests

Add CLI integration tests that run savanna CLI commands on an OpenStack Instance. This end-to-end integration testing validates CLI operation and is end-user focused, rather than api or client focused.

The CLI should be used for all operations that cause a state change. The client interface should be used to check the result of each operation.

The tests should cover:
* creation of a hadoop cluster, beginning with image registration, node and cluster template creation, and cluster launch
* teardown of the cluster and associated objects
* Execution of all supported EDP job types (and deletion of the objects associated with the job)
* cluster scaling

The tests should be implemented for each supported plugin type.

This blueprint includes the following work items, grouped by plugin type. Where
Prior blueprints that have been collapsed into this bp are listed for reference.

Vanilla plugin
--------------------

cluster launch [DONE https://review.openstack.org/75527]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-cluster-vanilla-integration-tests

cluster scale [OUTSTANDING / DEPENDENCY]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-cluster-scale-vanilla-integration-tests

java edp [DONE https://review.openstack.org/75527]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-java-edp-vanilla-integration-tests

mapreduce edp [DONE https://review.openstack.org/75527]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-mapreduce-edp-vanilla-integration-tests

hive edp [OUTSTANDING]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-hive-edp-vanilla-integration-tests

pig edp [DONE https://review.openstack.org/75527]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-pig-edp-vanilla-integration-tests

HDP plugin
-----------------

cluster launch [DONE]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-cluster-hdp-integration-tests

cluster scale [OUTSTANDING / DEPENDENCY]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-cluster-scale-hdp-integration-tests

java edp [DONE]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-java-edp-hdp-integration-tests

mapreduce edp [DONE]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-mapreduce-edp-hdp-integration-tests

hive edp [OUTSTANDING]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-hive-edp-hdp-integration-tests

pig edp [DONE]
https://blueprints.launchpad.net/python-savannaclient/+spec/cli-pig-edp-hdp-integration-tests

Vanilla 2 plugin
-----------------------

cluster launch [DONE]
cluster scale [OUTSTANDING / DEPENDENCY]
java edp [DONE]
mapreduce edp [DONE]
hive edp [OUTSTANDING / DEPENDENCY]
pig edp [DONE]