A time out occurs ten minutes after starting VNF create.
If the creation is not complete within ten minutes, it always
fails.
To prevent this, the timeout mins value of Heat Stack create is
changed from "10" to "(retry times) * (wait time)" defined in
Tacker's CONF.
Change-Id: I3b46fff45290904abbdc5e1c356e0215b653b9f5
Closes-Bug: #1885080