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

.yamllint

+---
 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
\ No newline at end of file
+      etc/kolla/globals.yml

tests/pre.yml

@@ -3,6 +3,9 @@
   any_errors_fatal: true
   vars:
     logs_dir: "/tmp/logs"
+  roles:
+    - bindep
+    - multi-node-firewall
   tasks:
     # We have had cases where the nodepool private IP address is not assigned,
     # which causes hard to diagnose errors later on. Catch it early.
@@ -103,5 +106,3 @@
     - name: Ping across VXLAN
       command: ping -c1 {{ hostvars[item].api_interface_address }}
       with_inventory_hostnames: all
-  roles:
-    - multi-node-firewall