Using HttpNfcLease to transfer vmdk files.

The current VMware driver supported only "sparse" and "preallocated"
vmware_disktype property set in a "vmdk" glance image. Both of these were just
copied over as *-flat.vmdk files into the vmfs or nfs file system of the
underlying datastore. This was used during copy_image_to_volume() api.
Unfortunately for a vsan datastore this work flow breaks since there is no
access to the flat vmdk file in the underlying datastore.

This patch introduces a new vmware_disktype for a glance image called
"streamOptimized". This is a format generated when a VM/vApp is exported using
the HttpNfc APIs. AS the name suggests this is a highly optimized format for
streaming in chunks and thus would result in much faster upload / download
speeds. The driver's copy_volume_to_image() implementation now always uploads
the vmdk contents using HttpNfc api so that the glance image ends up in the
"streamOptimized" disk type. Also the driver's copy_image_to_volume()
implementation now understands a "streamOptmized" disk type and uses HttpNfc to
import that vmdk into a backing VM.

Note that the same "streamOptmized" glance image format will also be supported
by VMware nova driver. This change is in a different patch -
https://review.openstack.org/#/c/53976/

Patch Set 4: Removing changes to requirements.txt that got in by mistake.
Patch Set 5: Fixing a small bug around progress updates.
Patch Set 6: Addressing comments from Avishay.

Fixes bug: 1229998

Change-Id: I6b55945cb61efded826e0bcf7e2a678ebbbbd9d3
Add default quota class into DB during migration

For some time now use_default_quota_class has been the
default setting for Cinder.  Cinder, however, has not been putting
any defaults for the default quota class into the database.  This
resulted in any command that queried for the default quotas to cause
the message "Deprecated: Default quota for resource: <resource> is set
by the default quota flag: <quota flag>, it is now deprecated.  Please use
the default quota class for default quota."

This commit resolves this issue by setting the default value for volumes,
snapshots and gigabytes in the quota_class table at migration time if there
is not already a class_name of 'default' in the quota_classes table.

Unit tests are included with this commit.

Closes-bug 1233763
Change-Id: I457ed8a9b78492eda22e31dfc198b2ee051d3ece
Merge "Using HttpNfcLease to transfer vmdk files."
Merge "Add default quota class into DB during migration"