Astara mitaka-3 milestone release

This adds tag info for the mitaka-3 8.0.0.0b3 dev. milestone for
the following non-released managed repos:

    - openstack/astara
    - openstack/astara-appliance
    - openstack/astara-neutron
    - openstack/astara-horizon

Change-Id: Ibf9282afef41ff5c2eaff751b110b9f84c57bc4c

deliverables/mitaka/astara-appliance.yaml

@@ -10,3 +10,7 @@ releases:
     projects:
       - repo: openstack/astara-appliance
         hash: 7cc0742a1baae8b3ba31114d19848d02b9d65f27
+  - version: 8.0.0.0b3
+    projects:
+      - repo: openstack/astara-appliance
+        hash: f27ff0a64337696c1c7b6432b2689eef8f1b5b37

deliverables/mitaka/astara-horizon.yaml

@@ -10,3 +10,7 @@ releases:
     projects:
       - repo: openstack/astara-horizon
         hash: fa5da56e9129d0e6b9147d2498d5daef4e6bc84b
+  - version: 8.0.0.0b3
+    projects:
+      - repo: openstack/astara-horizon
+        hash: 3ad2cfbc1c8fa8a7de648ca8e4ca4e8c5a8ef64d

deliverables/mitaka/astara-neutron.yaml

@@ -10,3 +10,7 @@ releases:
     projects:
       - repo: openstack/astara-neutron
         hash: f8fa1df56de821f445dfd6ff314a6a538ef64ebf
+  - version: 8.0.0.0b3
+    projects:
+      - repo: openstack/astara-neutron
+        hash: 8111a7bd61c994a70062d2a9eff8bab482f78088

deliverables/mitaka/astara.yaml

@@ -10,3 +10,7 @@ releases:
     projects:
       - repo: openstack/astara
         hash: f2360d861f3904c8a06d94175be553fe5e7bab05
+  - version: 8.0.0.0b3
+    projects:
+      - repo: openstack/astara
+        hash: 5d2be5062c509f6b03ea189bf67d836ea0f213a9