Stop gathering facts for host command run

This will speed up `kayobe overcloud host command run`.

Change-Id: I02adfa5819bff781e1649b81c1023b55de32ebd0

ansible/host-command-run.yml

 ---
 - name: Run a command
+  gather_facts: False
   hosts: seed-hypervisor:seed:overcloud
   tasks:
     - name: Run a command