Fix parameter type spelling tempest HOT template

HOT template file heat_minimal_hot.yaml uses uppercase spelling
for parameters, where HOT should use lowercase (e.g. string instead
of String).
While code has has been toloerant so far, the following change for
parameter schema validation refactoring make checking more strict
and causes tempest to fail:

https://review.openstack.org/67183

This patch fixes parameter type spelling in the tempest HOT
template.

Change-Id: I52a1b2272cd299cce3259805ee240a5782772aa4
Closes-Bug: #1270833
Specify 'active' status for deleting situations

The test creates 3 backups with the rotation 2 and checks that
2 backups exist with getting its image list. test_create_backup
fails sometimes due to the existence of 3 backups.

Glance v1 delete_image API changes an image's status to 'deleted'
then the deleted flag to 'true'. If getting a list between the
status change and the delete flag change, we can get a list including
the deleting backup also like the following:

{"images": [
  {"status": "deleted", "name": "backup-1-tempest-438772029",
   "deleted": false, ..},
  {"status": "active", "name": "backup-2-tempest-2111479443",
   "deleted": false, ..},

To avoid this situation, this patch adds the status 'active' to the
calls which get the backup list.

Change-Id: I59966534a8eb1430604cada1f64b8c8df46a5f17
Closes-Bug: #1267326
Merge "Specify 'active' status for deleting situations"
Merge "Fix parameter type spelling tempest HOT template"