update api-sig meeting times

The api-sig is converting from a regular weekly meeting to office hours,
this change reflects that.

* added new meeting time
* updated channel for meeting
* changed chairs

Change-Id: I8117df2259509b4dbbb8b67eed17964550ef32cd

meetings/api-special-interest-group-meeting.yaml

@@ -1,13 +1,18 @@
-project: API Special Interest Group
+project: API Special Interest Group office hours
 meeting_id: api_sig
-agenda_url: https://wiki.openstack.org/wiki/Meetings/API-SIG#Agenda
+agenda_url: https://wiki.openstack.org/wiki/Meetings/API-SIG
 schedule:
   - time:       '1600'
     day:        Thursday
-    irc:        openstack-meeting-3
+    irc:        openstack-sdks
     frequency:  weekly
     start_date: 20160114
-chair: Michael McCune (elmiko), Chris Dent (cdent), Ed Leafe (edleafe)
+  - time:       '0900'
+    day:        Thursday
+    irc:        openstack-sdks
+    frequency:  weekly
+    start_date: 20181004
+chair: Michael McCune (elmiko), Ed Leafe (edleafe), Dmitry Tantsur (dtantsur)
 description:  >
   To propose, discuss, review and advocate for API guidelines for all
   OpenStack Programs to follow.