moving existing swauth unit tests

moving existing swauth unit tests
to gluster-swift unit tests location

Change-Id: I3445b7ef1a1abe584854f2b04ffc9949b3346814
Signed-off-by: Thiago da Silva <thiago@redhat.com>
Reviewed-on: http://review.gluster.org/6106
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>