Fixed attach volume for EMC SMI-S iSCSI driver

This problem was encountered during Grizzly RC1 testing.  The driver
didn't find the correct target IQN.  As a result, Nova couldn't find
the matching path in /dev/disk/by-path and therefore detached the volume.

Change-Id: I8bcf6d9896b9d445f6376ecc3a5695be46507663
Fixes: bug #1157912
Snapshot reservation sync calls wrong resource.

The snapshot reservations code isn't calling the
correct resource on sync (it's calling volumes).  There's
also some problems with the logic being used on the delete/clean up
that are fixed here as well.

Fixes bug: 1157506
Fixes bug: 1157982

Change-Id: I91327b8043ab63aa35ea8a91b6de544bf5bf6c61
Merge "Snapshot reservation sync calls wrong resource."
Merge "Fixed attach volume for EMC SMI-S iSCSI driver"