VMware: remove duplicate _fake_create_session code

This patch pulls the _fake_create_session method out so it can be reused
across tests rather than duplicated it.

Change-Id: Ie3979a84568571b2f1f63e01c6c5fb6966f0333a
Closes-bug: 1312472
VMware: remove unneeded code

Change-Id: Ia5ef0e48227ad81407c452a4f57677f2a3b7848c
Create the image mappings BDMs earlier in the boot

Refactor the processing of BDMs defined in the image (either as a block
device mapping in the properties or mappings of blank devices) and move
it to the same method where the rest of BDMs are processed.

Partial-bug: #1297325
Change-Id: Ida0ddb6efcb0014890762df000eaea679f9b1d7b
Merge "VMware: remove duplicate _fake_create_session code"
Merge "VMware: remove unneeded code"
Merge "Create the image mappings BDMs earlier in the boot"
Revert "Address the comments of the merged image handler patch"

This reverts commit 9e8513e6fe4bf8a8759ad0c1d71594f952d920ad.

Change-Id: I3cf8000a3e984c57441a226d3139acbf3e346825
Move libvirt RBD utilities to a new file

This will make it easier to share rbd-related code with
cinder and glance. Port the applicable unit tests over
from cinder.

Change-Id: I5bf08da87daf1d98f326f21cf33aba68aa830785
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Use library instead of CLI to cleanup RBD volumes

'rbd list' CLI returns error code when there are no rbd volumes, which
causes problems during live migration of VMs with RBD backed ephemeral
volumes. It's safer to use the library that only raises an exception in
case of a real problem.

The only case where rbd CLI is still justified is import, which is
needed to correctly import sparse image files.

All code related to cleanup of RBD volumes is moved to rbd_utils.py,
this fixes a yo-yo problem with single-use methods scattered across 3
different files, and minimizes impact of this fix on imports in
imagebackend and utils.

Flake8 F401 in test_libvirt.py has to be ignored since flake8 doesn't
recognize use of an imported module in a @mock.patch decorator.

Change-Id: I92cd6b16fbd93b377fe47b15d22efbbf68d02513
Signed-off-by: Dmitry Borodaenko <dborodaenko@mirantis.com>
enable cloning for rbd-backed ephemeral disks

Currently when using rbd as an image backend, nova downloads the
glance image to local disk and then copies it again into rbd. This
can be very slow for large images, and wastes bandwidth as well as
disk space.

When the glance image is stored in the same ceph cluster, the data is
being pulled out and pushed back in unnecessarily. Instead, create a
copy-on-write clone of the image. This is fast, and does not depend
on the size of the image. Instead of taking minutes, booting takes
seconds, and is not limited by the disk copy.

Add some rbd utility functions from cinder to support cloning and
let the rbd imagebackend rely on librbd instead of the rbd
command line tool for checking image existence.

Add a direct_fetch() method to the image backend, so backends like rbd
can make optimizations like this. Try to use direct_fetch() for the root
disk when it comes from an image, but fall back to fetch_to_raw() if
direct_fetch() fails.

Implements: blueprint rbd-clone-image-handler
Closes-Bug: 1226351
Change-Id: I9b77a50206d0eda709df8356faaeeba35d232f22
Co-Authored-By: Dmitry Borodaenko <dborodaenko@mirantis.com>
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
Signed-off-by: Dmitry Borodaenko <dborodaenko@mirantis.com>