distaflibs: organize distaflibs to use namespace packages

Organized the distaflibs directory tree to accomodate namespace packages.

* Allows multiple distaf library packages to install in single namespace package.
- Created distaflibs-gluster directory as root for package configs, docs, etc.
- Created setup.py file to install distaflibs-gluster package into namespace.
- Created distaflibs-gluster/distaflibs namespace package dir and init.
- Created distaflibs-gluster/distaflibs/gluster as package dir.
- Copied distaf gluster library files into package dir.

Requires the distaf package.

distaflibs-gluster installs into /usr/lib/python2.7/site-packages/distaflibs/gluster

Change-Id: I775c4f1526880ea606f35c3616abb9aaf2f3b886
BUG: 1330346
Signed-off-by: Jonathan Holloway <jholloway@redhat.com>
Reviewed-on: http://review.gluster.org/13972
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: M S Vishwanath Bhat <vbhat@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>

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