remove swift cli tests

These are covered by swiftclient functional testing, no need to have
them also in Tempest.

These are functionally covered by:

http://git.openstack.org/cgit/openstack/python-swiftclient/tree/tests/unit/test_shell.py

and

http://git.openstack.org/cgit/openstack/python-swiftclient/tree/tests/functional/test_swiftclient.py

Change-Id: Iffb75d10ad07d1516660549fc8eb60204aac4904
3 files changed