Add a sleep after delete before purging

heat-manage purge_deleted 0 might not purge deleted stacks which are
less than a second old, this is a cause of gate failures.

Change-Id: Ie95370354aa0534483730ef1ce93f46d004931d8
Closes-Bug: 1570398
1 file changed
tree: f3beec1649810104542f0e4c0f29a0f2e6f0a941
  1. common/
  2. functional/
  3. scenario/