Support environments being deleted of with delete failure

Correctly display environments that has deletion going on
or had failed during that process (and thus remained in the list)

Also adds support for new environment statuses

This is a dashboard supplement to https://review.openstack.org/109508
and should be merged be merged *BEFORE* API change

Change-Id: I7ddb9828f584274f93427d03b53e571d591f0097
Merge "Support environments being deleted of with delete failure"