CI: periodic job pingtest fails because of timeout of stack creation

[Sagi (Sergey) Shnaidman]

Creating stack for pingtest takes about 360 seconds now and it fails:

https://github.com/openstack-infra/tripleo-ci/blob/master/scripts/tripleo.sh#L753

if tripleo wait_for -w 300 -d 10 -s "CREATE_COMPLETE" -f "CREATE_FAILED" -- "heat stack-list | grep tenant-stack"; then

From logs:

http://logs.openstack.org/periodic/periodic-tripleo-ci-centos-7-ovb-ha/0ae3179/console.html#_2016-10-31_07_52_47_379372

2016-10-31 07:52:47.379372 | WARNING (shell) "heat stack-list" is deprecated, please use "openstack stack list" instead
2016-10-31 07:52:53.278703 | +--------------------------------------+--------------+--------------------+----------------------+--------------+
2016-10-31 07:52:53.278847 | | id | stack_name | stack_status | creation_time | updated_time |
2016-10-31 07:52:53.278911 | +--------------------------------------+--------------+--------------------+----------------------+--------------+
2016-10-31 07:52:53.278968 | | 614c4bbd-f445-4717-ac0a-b6324775fa6b | tenant-stack | CREATE_IN_PROGRESS | 2016-10-31T07:52:37Z | None |
2016-10-31 07:52:53.279041 | +--------------------------------------+--------------+--------------------+----------------------+--------------+
2016-10-31 07:57:58.084956 | Timing out after 300 seconds:

http://logs.openstack.org/periodic/periodic-tripleo-ci-centos-7-ovb-ha/0ae3179/logs/overcloud-controller-0/var/log/heat/heat-engine.txt.gz#_2016-10-31_07_58_19_182

2016-10-31 07:58:19.182 32149 INFO heat.engine.stack [req-339f8d7f-d84d-46bc-86b1-9842865c4d66 b400af498a464a6f898a2ad4dfdceb03 75f8c63a65624a359f7d502fee716e29 - - -] Stack CREATE COMPLETE (tenant-stack): Stack CREATE completed successfully