Create a RemoteFsDriver class

This class holds common functions for drivers similar to NFS.

Change-Id: I83d89c971fd0153df7702e2803bed66df1a759f6
Adding support for Coraid AoE SANs Appliances.

This driver provide support for Coraid hardware storage appliances
using AoE (ATA Over Ethernet) protocol.

Implements blueprint coraid-volume-driver

Reference to Nova patch libvirt-aoe :
https://review.openstack.org/21101

The following operations are supported :
-- Volume Creation with Volume Types
-- Volume Deletion
-- Volume Attach
-- Volume Detach
-- Snapshot Creation
-- Snapshot Deletion
-- Create Volume from Snapshot
-- Volume Stats

The driver only work when operating on EtherCloud ESM,
Coraid VSX and Coraid SRX Appliances.

Change-Id: I7c8dde0c99698b52c151a4db0fb1bb94d516db61
Merge "Adding support for Coraid AoE SANs Appliances."
Merge "Create a RemoteFsDriver class"