shouldn't allow API request url without version field

[Liusheng]

Currently, Mogan support request API with url including "v1" or not, see the following example, comparing with most other OpenStack APIs, it is unreasonble to support both these two way to access API, the "v1" should be forcibly included in the API request url.

root@liusheng:/opt/stack/mogan/mogan/api/controllers# curl -g -i -X GET http://192.168.0.135/baremetal_compute/v1/servers/detail -H "User-Agent: python-moganclient" -H "Accept: application/json" -H "X-Auth-Token: $(openstack token issue -f value -c id)"
HTTP/1.1 200 OK
Date: Thu, 23 Nov 2017 09:17:49 GMT
Server: Apache/2.4.18 (Ubuntu)
Content-Length: 989
Content-Type: application/json
Openstack-Request-Id: req-206ca535-9e13-4c1a-b6fa-319877f82cca
Connection: close

{"servers": [{"status": "active", "node": "node-0", "addresses": {"432c58a4-e616-48f2-a592-069350c8de4d": [{"type": "fixed", "addr": "10.0.0.7"}, {"type": "fixed", "addr": "fdc1:111a:e65d:0:f816:3eff:fe56:3f7e"}]}, "user_id": "a3efc47b85014843b93e06fa176c8ff1", "description": null, "links": [{"href": "http://192.168.0.135/v1/servers/9f4ebb0b-7596-456d-8de8-c1b742ea8b4b", "rel": "self"}, {"href": "http://192.168.0.135/servers/9f4ebb0b-7596-456d-8de8-c1b742ea8b4b", "rel": "bookmark"}], "availability_zone": null, "updated_at": "2017-11-23T01:07:27+00:00", "key_name": null, "partitions": {}, "metadata": {}, "locked": false, "name": "test", "affinity_zone": null, "power_state": "power on", "image_uuid": "a765954c-92e6-4f3a-ad13-6412be6047b7", "flavor_uuid": "abad84a7-d4eb-4cae-9f7c-c39ebab7c55d", "created_at": "2017-11-23T01:05:11+00:00", "project_id": "dea7c33a22fd4e96b1b3a0afcbc17586", "launched_at": "2017-11-23T01:07:27+00:00", "uuid": "9f4ebb0b-7596-456d-8de8-c1b742ea8b4b"}]}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/522496

[OpenStack Infra (hudson-openstack)]

Change abandoned by liusheng (<email address hidden>) on branch: master
Review: https://review.openstack.org/522496
Reason: it is better to to use specified version in headers in future(which we will support microversion)