Drop bots from #openstack-astara

The astara project has recently been removed from openstack governance [1].
This patch frees up the IRC bots from #openstack-astara so their resources
can be used elsewhere.

[1] https://review.openstack.org/#/c/376609/

Depends-On: Ic1b9989cfe8a26269a532c3bf4d9cfa387223ab8
Change-Id: I77e34a6c81057f91b44403dce4bda7427eb14f1f

accessbot/channels.yaml

@@ -85,7 +85,6 @@ channels:
   - name: openstack-anvil
   - name: openstack-api
   - name: openstack-app-catalog
-  - name: openstack-astara
   - name: openstack-bacon
   - name: openstack-barbican
   - name: openstack-bareon

gerritbot/channels.yaml

@@ -336,21 +336,6 @@ openstack-app-catalog:
   branches:
     - master
 
-openstack-astara:
-  events:
-    - patchset-created
-    - change-merged
-    - x-vrif-minus-2
-  projects:
-    - openstack/astara
-    - openstack/astara-appliance
-    - openstack/astara-horizon
-    - openstack/astara-neutron
-  branches:
-    - master
-    - stable/liberty
-    - stable/juno
-
 openstack-barbican:
   events:
     - patchset-created