Fix brick remotefs dependency on cinder

This patch moves an exception from cinder.exception
into brick.exception to fix an import in remotefs.

Fixes Bug #1221309

Change-Id: I9b060c1e1129b3fe30145227712d0234e0f42504

cinder/brick/exception.py

@@ -126,3 +126,7 @@ class ISCSITargetRemoveFailed(BrickException):
 
 class ISCSITargetAttachFailed(BrickException):
     message = _("Failed to attach iSCSI target for volume %(volume_id)s.")
+
+
+class ProtocolNotSupported(BrickException):
+    message = _("Connect to volume via protocol %(protocol)s not supported.")

cinder/brick/remotefs/remotefs.py

@@ -22,7 +22,7 @@
 
 from oslo.config import cfg
 
-from cinder import exception
+from cinder.brick import exception
 from cinder.openstack.common.gettextutils import _
 from cinder.openstack.common import log as logging
 from cinder.openstack.common import processutils as putils

cinder/exception.py

@@ -609,10 +609,6 @@ class VolumeMigrationFailed(CinderException):
     message = _("Volume migration failed") + ": %(reason)s"
 
 
-class ProtocolNotSupported(CinderException):
-    message = _("Connect to volume via protocol %(protocol)s not supported.")
-
-
 class SSHInjectionThreat(CinderException):
     message = _("SSH command injection detected") + ": %(command)s"