Updated openstack/openstack
Project: openstack/nova  4056face73269f40b38dc7ded8ccfbf09d28642f

Remove snapshot_id from _volume_snapshot_create()

There is an argument "snapshot_id" in _volume_snapshot_create(), but
the argument is not used in _volume_snapshot_create().
This patch removes it for cleanup.

Change-Id: Ibaad290e149a863c749c74ace3ba702870b8dd1b