Adding volume driver for X-IO ISE

Driver is implemented using one base class XIOISEDriver and two
classes, one for each storage protocol.

This change also addresses version 1.1.0 of the driver that
adds support for:
- QoS
- Volume affinity
- Thin
- Retype

Driver Cert results:
https://bugs.launchpad.net/cinder/+bug/1360078

Unit test tests all required interfaces for both driver types.

Change-Id: I2eeb44e768871e02e407f93243aabef993f96d53
Implements: blueprint xio-iscsi-fc-volume-driver
Implements: blueprint xio-volume-driver-1-1

cinder/exception.py

@@ -880,3 +880,8 @@ class ISCSITargetRemoveFailed(CinderException):
 
 class ISCSITargetAttachFailed(CinderException):
     message = _("Failed to attach iSCSI target for volume %(volume_id)s.")
+
+
+# X-IO driver exception.
+class XIODriverException(VolumeDriverException):
+    message = _("X-IO Volume Driver exception!")

cinder/volume/driver.py

@@ -127,6 +127,10 @@ volume_opts = [
                default=None,
                help='The path to the client certificate for verification, '
                     'if the driver supports it.'),
+    cfg.BoolOpt('driver_use_ssl',
+                default=False,
+                help='Tell driver to use SSL for connection to backend '
+                     'storage if the driver supports it.'),
 ]
 
 # for backward compatibility

etc/cinder/cinder.conf.sample

@@ -1110,6 +1110,10 @@
 # driver supports it. (string value)
 #driver_client_cert=<None>
 
+# Tell driver to use SSL for connection to backend storage if
+# the driver supports it. (boolean value)
+#driver_use_ssl=false
+
 
 #
 # Options defined in cinder.volume.drivers.block_device
@@ -2201,6 +2205,28 @@
 #windows_iscsi_lun_path=C:\iSCSIVirtualDisks
 
 
+#
+# Options defined in cinder.volume.drivers.xio
+#
+
+# Default storage pool for volumes. (integer value)
+#ise_storage_pool=1
+
+# Raid level for ISE volumes. (integer value)
+#ise_raid=1
+
+# Number of retries (per port) when establishing connection to
+# ISE management port. (integer value)
+#ise_connection_retries=5
+
+# Interval (secs) between retries. (integer value)
+#ise_retry_interval=1
+
+# Number on retries to get completion status after issuing a
+# command to ISE. (integer value)
+#ise_completion_retries=30
+
+
 #
 # Options defined in cinder.volume.drivers.zadara
 #