Make update server schema 'additionalProperties' False

Nova V2.1 API has strong input validation by making validation
through JSON schema.

This patch makes update server schema 'additionalProperties' to False
as all update server extensions are implemented in V2.1.

After this, V2.1 will not allow extra arg for update server.

This patch also modify the corresponding update server tests
for extra input passed in request body-
    test_update_server_admin_password_ignored

Partially implements blueprint v2-on-v3-api

Change-Id: Ib67880d0380b539c3a5b12a14ea9ed71b7b588a3
Remove instance_uuids from request_spec

instance_uuids was previously deprecated in Scheduler RPC API 3.0, so now we
bumped the version to 4.0, there is no longer methods which need this.

So, we can just remove it from FilterScheduler._schedule() method and also
leave sched_utils.set_vm_state_and_notify() method use the uuid from
instance_properties.
scheduler_utils.setup_instance_group() is also modified to get the uuid
from instance_properties.

Change-Id: I26003dc27a2bc3f30f1b09000533b571096c8b21
Partially-Implements: blueprint request-spec-object
Merge "Remove instance_uuids from request_spec"
Merge "Make update server schema 'additionalProperties' False"