LIO: Fix UnboundLocalError in ensure_export
LIO: Fix UnboundLocalError in ensure_export

If db.volume_get() fails here, volume_info (and chap_auth)
are unbound, and the below usages will fail.

volume_get() failing is the only way to land in the NotFound
handler, so just remove this debug line.  It won't ever have
info to print.

Move code not related to db lookup out of this try block, and
return when NotFound occurs.

Closes-Bug: #1387866

Change-Id: I13a88bec1a66d8a0794b08514cc9844d60f6c809
(cherry picked from commit dac4e044660b20eb4aed80cfe58cd9d5b88e14a7)

alex8866/cinder,redhat-openstack/cinder,redhat-openstack/cinder,alex8866/cinder