Fix Live Migration for Nimble Storage Driver
Fix Live Migration for Nimble Storage Driver

The previous fix for Live Migration
https://review.openstack.org/#/c/420214/ broke our Live
Migration. When checking for Error message in exception,
it needs to be typecast to six.text_type()
This patch resolves the problem.

Change-Id: I0871fb0f5a63cfe17ebf328e7ce8a2fff34fcdb4
Closes-Bug: #1481953

phenoxim/cinder,eharney/cinder,Datera/cinder,openstack/cinder,j-griffith/cinder,phenoxim/cinder,j-griffith/cinder,eharney/cinder,mahak/cinder,ge0rgi/cinder,openstack/cinder,mahak/cinder,Datera/cinder