In change I78cb60168aaa40bb6439198283546b7faf33917c, action was changed
to kolla_action, and serial to kolla_serial, to avoid Ansible warnings
due to use of reserved keywords. In that change, some keywords were
missed, and some changes that were merged since then have not switched
to the new variables. This change fixes all current instances of those
issues.

Change-Id: I357dffdfcb2b405e280a962d366ee65eebf0a8d1
Implements: blueprint migrate-to-ansible-2-2-0

This patchset implements yamllint test to all *.yml
files.

Also fixes syntax errors to make jobs to pass.

Change-Id: I3186adf9835b4d0cada272d156b17d1bc9c2b799

The ansible/kolla-host.yml playbook failed when called with a --limit
flag.

This was due to the fact that only the facts of the subset of hosts
were gathered but the "Generate /etc/hosts for all of the nodes" task
is using the ansible_<IFACE>.ipv4.address variable of all hosts.

The code for this fix is copied from the site.yml playbook
where it was used for the same reason.

Change-Id: I7e70caf750506ad8ab36ec024bd9647dd733fbd0
Closes-Bug: #1713725

Change-Id: I44c2668a8ebb6dd3201a6eb4e47284871380e6d7

Change-Id: Ie70db1b18a73528b1194e4fbcf53d09fed20f4a0
Implements: blueprint kolla-host