Use OSA's stable/newton version of tempest
Use OSA's stable/newton version of tempest

This commit updates scripts/deploy.sh to use OSA's stable/newton
version of tempest.  We cannot have the repo server build the later
version as requirements of this version do not fall in line with
stable/mitaka's global requirements.

Bumping tempest specifically should fix the frequent
test_reboot_server_hard failures that we are seeing, but hopefully
fixes other issues also.

The upstream tempest review which addresses the issue:

[1] https://review.openstack.org/#/c/340723/

Connects https://github.com/rcbops/u-suk-dev/issues/278

mancdaz/rpc-openstack,jacobwagner/rpc-openstack,BjoernT/rpc-openstack,git-harry/rpc-openstack,galstrom21/rpc-openstack,galstrom21/rpc-openstack,hughsaunders/rpc-openstack,shannonmitchell/rpc-openstack,rcbops/rpc-openstack,major/rpc-openstack,mancdaz/rpc-openstack,robb-romans/rpc-openstack,prometheanfire/rpc-openstack,jacobwagner/rpc-openstack,shannonmitchell/rpc-openstack,robb-romans/rpc-openstack,git-harry/rpc-openstack,cfarquhar/rpc-openstack,prometheanfire/rpc-openstack,cfarquhar/rpc-openstack,major/rpc-openstack,BjoernT/rpc-openstack,cloudnull/rpc-openstack,cloudnull/rpc-openstack,hughsaunders/rpc-openstack,rcbops/rpc-openstack