Pin python requests when installing docker-compose

New urllib3 and python requests break python docker-compose. Pin
requests back which should use an older urllib3. Hopefully this fixes
docker-compose.

Note this should probably only be used as a temporary workaround. A more
permanent fix should change the way we install docker-compose.

Change-Id: Ib28a42c033aeccb6a13f179bb5e06e80304de528

playbooks/roles/grafana/tasks/main.yaml

@@ -111,5 +111,10 @@
   shell:
     cmd: docker image prune -f
 
+- name: Wait for grafana to be up and running
+  wait_for:
+    timeout: 60
+    port: 3000
+
 - name: Import dashboards to container
   command: '/usr/local/bin/update-grafana-dashboards'

playbooks/roles/install-docker/tasks/main.yaml

@@ -40,7 +40,9 @@
 
 - name: Install docker-compose
   pip:
-    name: docker-compose
+    name:
+      - requests<2.30.0
+      - docker-compose
     state: present
     executable: pip3