Add meeting_id's for Nova API and HyperV meetings

Looking at the channel utilisation these meetings are involved in
"full" slots.  In order to work out if they're active it's handy to
check the logs.  Adding a meeting_id simplifies this task.

Change-Id: Id64eadf05fa05612537e463936b566130917d58f

meetings/nova-api-meeting.yaml

@@ -1,5 +1,6 @@
 project:  Nova API Meeting
 agenda_url: https://wiki.openstack.org/wiki/Meetings/NovaAPI
+meeting_id: nova-api
 schedule:
   - time:       '1300'
     day:        Wednesday

meetings/nova-hyper-v-team-meeting.yaml

@@ -1,4 +1,5 @@
 project:  Nova Hyper-V Team Meeting
+meeting_id: hyper-v
 schedule:
   - time:       '1300'
     day:        Wednesday