Datastore & datastore analysis test

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