scheduler_hints ignored due to incorrect json tag in create request

[datwiz]

It appears that scheduler_hints are getting ignored during server create due to incorrect json tag being used in the create request. Currently the tag being used is "scheduler_hints":{"group":"perf-same-host"}
Checking OpenStack API documentation for Kilo and Juno, the tag should be "os:scheduler_hints":{"group":"perf-same-host"}
API reference. http://developer.openstack.org/api-ref-compute-v2-ext.html#os-scheduler-hints

Fix requires changing the hash key in client/nova.rb along with the corresponding client/nova_spec.rb "all options specified" test case.

excerpt from debug log below, using v0.6.0.

2015-05-30 21:44 | DEBUG | create_server - start
2015-05-30 21:44 | DEBUG | request  => method  : POST
2015-05-30 21:44 | DEBUG | request  => url     : http://openstack:8774/v2/827ce29792c94e4b9d94d5515aebd852/servers
2015-05-30 21:44 | DEBUG | request  => headers : {"X-Auth-Token"=>"fdfef5f269b24925af2f68dd9d188a98", :accept=>:json, :content_type=>:json}
2015-05-30 21:44 | DEBUG | request  => body    : {"server":{"name":"perf-a-01","imageRef":"63118138-add1-4277-9934-14e9402cae93","flavorRef":"f71e4891-c37f-4b90-9ffe-f3e8319fa273","key_name":"vagrant-generated-jv5tzchf","security_groups":[{"name":"petnet-secgroup"}],"networks":[{"uuid":"61e932a6-d19d-40d9-8c3f-08d9663c5ae7"}]},"scheduler_hints":{"group":"perf-same-host"}}
2015-05-30 21:44 | DEBUG | response => code    : 202
2015-05-30 21:44 | DEBUG | response => headers : {:location=>"http://openstack:8774/v2/827ce29792c94e4b9d94d5515aebd852/servers/b7d430ad-cb94-4aae-bea9-b9cde226349d", :content_type=>"application/json", :content_length=>"442", :x_compute_request_id=>"req-13672300-582d-426b-9684-571759066c4c", :date=>"Sat, 30 May 2015 11:44:25 GMT"}
2015-05-30 21:44 | DEBUG | response => body    : {"server": {"security_groups": [{"name": "petnet-secgroup"}], "OS-DCF:diskConfig": "MANUAL", "id": "b7d430ad-cb94-4aae-bea9-b9cde226349d", "links": [{"href": "http://openstack:8774/v2/827ce29792c94e4b9d94d5515aebd852/servers/b7d430ad-cb94-4aae-bea9-b9cde226349d", "rel": "self"}, {"href": "http://openstack:8774/827ce29792c94e4b9d94d5515aebd852/servers/b7d430ad-cb94-4aae-bea9-b9cde226349d", "rel": "bookmark"}], "adminPass": "Hbf7h6SdSzTP"}}
2015-05-30 21:44 | DEBUG | create_server - end