Revert "Introduce wait_backoff, fail_if_empty wrappers"
Revert "Introduce wait_backoff, fail_if_empty wrappers"

This reverts commit d5be6a272216fd679882fd2bb86114e7871192ce.
Tested with https://review.openstack.org/#/c/540545/

Closes-Bug: #1747089
Change-Id: I96c0a15ae7068c067ff99ee84218dc52159933b9

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates