Raises NotImplementedError for LVM migration.

Currently migration of an LVM backed instance results in a new
instance being launched on the destination node, but the instance
disk is neither copied to the destination nor deleted on the
origin node. The problem is addressed by raising a NotImplementedError.

Closes-Bug: #1270305
Closes-Bug: #1245595
Closes-Bug: #1241866
Change-Id: I8010230b1aa5ddc322d0c93dd916b7700c25ab81
DocImpact
Add a missing instance=instance in compute/mgr

This can be logged without context at the moment, so we should really
include the instance parameter as normal.

Change-Id: I6062f32ae906d958e808c8f1574e0c16b687d856
VMware: fix crash when VC driver boots

Commit 1deb31f85a8f5d1e261b2cf1eddc537a5da7f60b caused the driver to break.
This adds the missing method.

Change-Id: Iaf7e33a868724efdcb13fdd9ba1c74b92d2e6210
Closes-bug: #1355875
Merge "Raises NotImplementedError for LVM migration."
Merge "Add a missing instance=instance in compute/mgr"
Merge "VMware: fix crash when VC driver boots"