Initial import of the swiftkerbauth

Imported code till commit f64a3354185f32928e2568d9ece4a52fa4746c05
Changed a code bit to import correct definitions.
kerbauth unit tests do run along with gluster-swift.
Install script does install swiftkerbauth.
import swiftkerbauth from http://review.gluster.org/swiftkrbauth.git

Change-Id: Ia89f2b77cc68df10dee2f41ce074f3381ac3c408
Signed-off-by: Chetan Risbud <crisbud@redhat.com>
Reviewed-on: http://review.gluster.org/6597
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>
Provide more generic string in testAssert of some TCs

CLI test case were failing on RHEL systems as the error string
on Fedora19 and RHEL6.4 systems are different however a more gereric
string is there on both of the systems and this is about that only.
It replaces the 'ECONNREFUSED' & 'No address associated with hostname'
with 'Check that the admin_url is valid'.Now the TCs pass on both of
the OS.

Change-Id: Iff8b2719e8917864ed8f80d961c55a7f9f6fc77b
Signed-off-by: Pushpesh Sharma <psharma@redhat.com>
Reviewed-on: http://review.gluster.org/6718
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>