Datastore & datastore analysis test

iPython notebook:
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Datastore object, navigation, new quadicon type and ListAccordion: https://url.corp.redhat.com/16a3b2c

Datastore analysis test:
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Add the following lines to `cfme_data.yaml` https://url.corp.redhat.com/03bda33 and run -k datastore_analysis

Also updated host analysis test to use ListAccordion instead of Listnav.

iSCSI datastores are not supported in CFME yet.