create basic Datastore page and support tagging of Infrastructure Mgmt Systems, Hosts and Datastores
added policy menu mixin
added basic unittests for clusters and datastores, fixed quadicon access, added detail page support
Adding 'Add method steps'

Modifying 'Add method steps'- to fix spacing
Adding test for pages/automate.py
Adding _wait_for_visible_element before clicking the 'Add' button
Adding _wait_for_results_refresh() to click() method
Adding _wait_for_results_refresh() to all fill methods
change paginator locator

Read the note in the docstring
add try/except around refresh button
add load_mgmt_system_details() and all_vms()
parm_rename & log_msg_update