Remove training guide/labs team meetings

The training labs team meeting has not been happening since
November 2016. The training guides meeting has not been
happening since September 2017.

Let's clean up those slots to let someone else take them.

Change-Id: Ice520afb53bdd1a829a4ebda016807d0099c5a32

meetings/doc-training-labs-team-meeting.yaml

@@ -1,13 +0,0 @@
-project:  Training Labs Team Meeting
-meeting_id: training_labs
-agenda_url: https://wiki.openstack.org/wiki/Meetings/training-labs
-schedule:
-  - time:       '1800'
-    day:        Monday
-    irc:        openstack-meeting-alt
-    frequency:  weekly
-    start_date: 20160106
-chair: Pranav Salunke (dguitarbite)
-description:  >
-  If you are interested in the OpenStack Training Labs feel free to join one of
-  our public meetings. We have one meeting every week.

meetings/training-guides-team-meeting.yaml

@@ -1,13 +0,0 @@
-project:  Training-guides Team Meeting
-meeting_id: training_guides
-agenda_url: https://etherpad.openstack.org/p/training-guides-meeting-agenda
-schedule:
-  - time:       '1300'
-    day:        Tuesday
-    irc:        openstack-meeting-3
-    frequency:  weekly
-    start_date: 20161108
-chair:  Matjaz Pancur (matjazp)
-description:  >
-  The Training guides team creates open source OpenStack Upstream training
-  and other OpenStack training materials.