Creating snapshot fails when image metadata has version field

Description:

When creating a snapshot of a server using the nova API, failure occurs if the image contains the metadata property "version". It seems like image metadata is passed as an argument to _create_v2 (nova/image/glance.py) which is then passed to call (nova/image/glance.py) as kwargs. The function already takes in context, method, and version arguments, so it seems that any of these metadata properties would cause the snapshot to fail.

OpenStack version : Pike
Nova API version : 2.1

Steps to reporduce:

1. Create an image with metadata property "version"
2. Launch an server using this image
3. Try to create a server snapshot of the server you just launched

image used:
+------------------+----------------------------------------------------------------------------+
| Field | Value |
+------------------+----------------------------------------------------------------------------+
| checksum | d19875d33815bd8c49fe39829b1df924 |
| container_format | bare |
| created_at | 2017-09-05T15:57:24Z |
| disk_format | raw |
| file | /v2/images/c7f76154-dd99-4102-afe2-662a4fcaba7b/file |
| id | c7f76154-dd99-4102-afe2-662a4fcaba7b |
| min_disk | 0 |
| min_ram | 0 |
| name | ubuntu-16.04-amd64_2 |
| owner | 71cea55297f94953b33b2a2549d72a95 |
| properties | architecture='amd64', direct_url='rbd://8838dc54-c385-4949-9624-1cf3911320 |
| | 1d/images/c7f76154-dd99-4102-afe2-662a4fcaba7b/snap', |
| | distribution='Ubuntu', family='Linux', username='ubuntu', version='16.04' |
| protected | False |
| schema | /v2/schemas/image |
| size | 2361393152 |
| status | active |
| tags | |
| updated_at | 2017-09-14T21:10:44Z |
| virtual_size | None |
| visibility | public |
+------------------+----------------------------------------------------------------------------+
Expected result:
succesfully create server snapshot

Actual result:

logs:

2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions [req-eea1ec3c-a500-4006-ab4d-00a05a6b4f33 f25d972f420840e48163a55bf5713bf6 c657c15a0a13435bbe2c323c732d4e4f - 0e46d3ad069b4f0e85bf594de38fbe0e 0e46d3ad069b4f0e85bf594de38fbe0e] Unexpected exception in API method: TypeError: call() got multiple values for keyword argument 'version'
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions Traceback (most recent call last):
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 336, in wrapped
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return f(*args, **kwargs)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/api/openstack/common.py", line 356, in inner
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return f(*args, **kwargs)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return func(*args, **kwargs)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return func(*args, **kwargs)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 999, in _action_create_image
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions extra_properties=metadata)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/api.py", line 208, in _wrapped
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return fn(self, context, instance, *args, **kwargs)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/api.py", line 148, in inner
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return f(self, context, instance, *args, **kw)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/api.py", line 2684, in snapshot
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions extra_properties=extra_properties)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/compute/api.py", line 2754, in _create_image
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return self.image_api.create(context, image_meta)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/image/api.py", line 108, in create
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions return session.create(context, image_info, data=data)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/image/glance.py", line 390, in create
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions data, force_activate)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/nova/image/glance.py", line 467, in _create_v2
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions context, 2, 'create', **sent_service_image_meta)
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions TypeError: call() got multiple values for keyword argument 'version'
2017-09-14 19:57:53.486 27 ERROR nova.api.openstack.extensions
<type 'exceptions.TypeError'>