Don't use rpc to lock/unlock an instance.

Instead of converting this method to send a full instance over rpc
instead of just an instance UUID, this patch removes the usage of rpc
for this operation entirely.  All it's doing is a database update.  RPC
is expensive, so cut out the middle-man.

One functional difference with this approach is that the db update is
now synchronous on the API node, instead of kicking off an async message
to a compute node to handle it.  This seems fine, though.

Part of blueprint no-db-messaging.

Change-Id: I15ceb7625425ab097eebd5b7dd3606a171329f97

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