Fixes a problem in attach volume in EMC driver.

This patch fixes a problem in attach volume in EMC SMI-S driver.
The existing logic checks if a volume is already attached to any host,
but it doesn't check whether a volume is already attached to the specific
host that nova wants cinder to attach.  As a result, initialize_connection
could return success (thinking it is already attached), but nova will
fail to discover the LUN later and fail the attach.

This patch adds a check to see if a volume is already attached to a
specific host.  If not, it will do the attach.  The reason that the
volume being attached already could be due to a nova live-migration
use case.  Cinder doesn't support multiple attaches currently, but
allows a volume to be attached multiple times from nova during
live-migration.

Change-Id: I05a2f57cd8708d7fcbe902ec13665a9cfb44db07
Closes-Bug: #1295906
NetApp cmode iscsi: Fix QOS extra spec

This patch fixes the incorrect behavior where the NetApp cmode
iscsi driver will choose to create a volume on a flexVol that has
a QOS policy group that matches the specified QOS policy group
intended for the cinder volume. The correct behavior is to ignore
the QOS policy group of the flexVol and instead assign the QOS policy
group to the newly created cinder volume.

Change-Id: Ibeb8e3b965af8e79d0294c5cf97410da2b44d40c
Partial-Bug: #1288283
Merge "NetApp cmode iscsi: Fix QOS extra spec"
Merge "Fixes a problem in attach volume in EMC driver."