Add meta to mistral

Mistral didn't get the meta/ information that is usually present
on all our roles.

This fixes it. I added mnaser and his company in meta, as he is
the original author of this role.
At the opposite of other roles, I didn't add the apt dependency.

Change-Id: Iba8ae5e8ded1398649792ecc5b4d9267551713c4

meta/main.yml

@@ -0,0 +1,41 @@
+---
+# Copyright 2014, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+galaxy_info:
+  author: mnaser@vexxhost.com
+  description: Installation and setup of mistral
+  company: Vexxhost
+  license: Apache2
+  min_ansible_version: 2.7
+  platforms:
+    - name: Debian
+      versions:
+        - stretch
+    - name: Ubuntu
+      versions:
+        - xenial
+        - bionic
+    - name: EL
+      versions:
+        - 7
+    - name: opensuse
+      versions:
+        - 15
+  categories:
+    - cloud
+    - python
+    - glance
+    - development
+    - openstack