Change name of DefCore to Interop WG

The Board of Directors has approved a plan to change the name of the
DefCore Committee to the Interop Working Group.[1]  Several changes
are in flight to complete the name change: this patch addresses the
need to change the name of the weekly IRC meeting.

[1]
https://wiki.openstack.org/wiki/Governance/Foundation/23Aug2016BoardMinutes

Change-Id: Iaa01c0e204728bb1b877e448fe172e84769102fb

meetings/defcore-meeting.yaml

@@ -1,13 +0,0 @@
-project:  DefCore Committee Meeting
-meeting_id: defcore
-schedule:
-  - time:       '1600'
-    day:        Wednesday
-    irc:        openstack-meeting-3
-    frequency:  weekly
-    start_date: 20160106
-chair: Mark Voelker (markvoelker), Egle Sigler (eglute)
-description:  >
-  This is the weekly meeting of the DefCore Committee.  During this meeting we
-  will cover DefCore process changes as well as capabilities scoring per agendas
-  published at https://wiki.openstack.org/wiki/Governance/DefCoreCommittee.

meetings/interop-wg-meeting.yaml

@@ -0,0 +1,15 @@
+project:  Interop Working Group Meeting
+meeting_id: interopwg
+schedule:
+  - time:       '1600'
+    day:        Wednesday
+    irc:        openstack-meeting-3
+    frequency:  weekly
+    start_date: 20160106
+chair: Mark Voelker (markvoelker), Egle Sigler (eglute)
+description:  >
+  This is the weekly meeting of the Interop Working Group.  During this meeting
+  we will cover process changes as well as capabilities scoring and other
+  topics announced on the mailing list.  For more information, please refer to
+  the wiki page at:
+  https://wiki.openstack.org/wiki/Governance/InteropWG.