CentOS python-2.6 fixes

* Need to replace functions which are not supported in python 2.6

Change-Id: I4308f7c43a60fde9d8538b53422ddc18499dc1f9
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/6457
Reviewed-on: http://review.gluster.org/6484