Add config option to use system token in keystone tests

Keystone suports both system as well as project scoped
token. All OpenStack services except ironic use the project
scoped token to talk to keystone. By default, Tempest will
test the keystone using project scoped token but add a
config option if system scoped token needs to be used
for testing.

Change-Id: I88128d935ac4bc1775ab986155bdd6b7ef8ae7c4
Signed-off-by: Ghanshyam Maan <gmaan@ghanshyammann.com>
2 files changed