Change network status cell values to Title case

All resources status values are presented as Title case except
networks's, appearing as Upper case.
I changed the network status values presentation to match
other resources, in order to maintain consistency.

Change-Id: I45e9dc18a8290745ae56dea82b5ccaff392822da
Closes-Bug: #1391482
Change CSV file date format to Horizon standard

This patch alters the date format to be 'YYYY-mm-dd', in line with the Overview
query directly by the "Download CSV Summary" button, and the rest of
Horizon.

Change-Id: I39b3bd68eed48ee3b4aace6e75d11f56b69decf4
Closes-Bug: 1387744
Remove 'action_*' for tables.LinkAction

'action_past' and 'action_present' is not needed for LinkAction in
openstack_dashboard/dashboards/admin/hypervisors/compute/tables.py
'EvacuateHost'. We can remove the codes safely.

Change-Id: Ib15224003892c0419e6e2aeeb9390bdf8fda6458
Closes-bug: #1394423
Merge "Remove 'action_*' for tables.LinkAction"
Merge "Change CSV file date format to Horizon standard"
Merge "Change network status cell values to Title case"