Rally keystone test scenarios for v3

Rally keystone test scenarios for v3

JIRA: FUNCTEST-652

1. Updated the Rally repository to master
the keystone test scenarios of TAG= 0.7.0 cannot run on Newton
also, 0.7.0 is the last tag that exists
2. Update the Tempest installation with updated rally command
Rally team said "there was no possibility to do it in backward
compatible way(rally verify re-design)"
3. The `rally show` was deprecated[1] in the master and corresponding
logic is updated
4. Update rally commands

[1]
https://github.com/openstack/rally/commit/f2fc3015beb4cfd8053db728765714500db6eeb2

Change-Id: Ief9e36a16dd92e4449c0f76579e7191a93aa3e21
Signed-off-by: helenyao <yaohelan@huawei.com>