Fix CI failures

1. Fix yamllint errors in .yamllint file(!)

YAML lint is currently failling on its own configuration file,
.yamllint. This change fixes the issues.

2. Run bindep role in Zuul jobs

This fixes an issue where libffi is not available.

Change-Id: Ic08a8e53a6905a68f0fe26d4b28184e62a64324f
(cherry picked from commit e3e5f7f20f)

.yamllint

@@ -1,3 +1,4 @@
+---
 extends: default
 ignore: |
   .tox/
@@ -8,8 +9,8 @@ rules:
   braces:
     max-spaces-inside: 1
   comments:
-    # Ignore first space in comment because we set default options as:
-    #openstack_version: "pike"
     require-starting-space: true
+    # Ignore comment validation in globals.yml - we break the
+    # require-starting-space rule.
     ignore: |
       etc/kolla/globals.yml

tests/pre.yml

@@ -2,6 +2,9 @@
 - hosts: all
   vars:
     logs_dir: "/tmp/logs"
+  roles:
+    - bindep
+    - multi-node-firewall
   tasks:
     - name: Install dbus for debian system
       apt: name=dbus
@@ -30,5 +33,3 @@
       hostname:
         name: "{{ inventory_hostname }}"
       become: true
-  roles:
-    - multi-node-firewall