Currently, we have a lot of logic for checking if a handler should run,
depending on whether config files have changed and whether the
container configuration has changed. As rm_work pointed out during
the recent haproxy refactor, these conditionals are typically
unnecessary - we can rely on Ansible's handler notification system
to only trigger handlers when they need to run. This removes a lot
of error prone code.

This patch removes conditional handler logic for all services. It is
important to ensure that we no longer trigger handlers when unnecessary,
because without these checks in place it will trigger a restart of the
containers.

Implements: blueprint simplify-handlers

Change-Id: I4f1aa03e9a9faaf8aecd556dfeafdb834042e4cd

This commit is to apply resource-constraints only to few OpenStack services.
Commit to apply constraints to other services will be made in coming commits.

Partially-Implements: blueprint resource-constraints

Change-Id: Icafa54baca24d2de64238222a5677b9d8b90e2aa

Add become to all tasks that use the module "kolla_docker"

Change-Id: I4309c4011687b88ec31d739fd8f834fe2326ff10
Partial-Implements: blueprint ansible-specific-task-become

- rename action and serial to kolla_ansible and kolla_serial
- use become instead of "sudo <command>" in shell
- Remove quota for failed_when and changed_when in rabbitmq tasks

Change-Id: I78cb60168aaa40bb6439198283546b7faf33917c
Implements: blueprint migrate-to-ansible-2-2-0

Assuming both Prometheus and Grafana are enabled, this change
configures Grafana such that it can use data collected by the
Prometheus server.

Partially-Implements: blueprint prometheus
Change-Id: I0290806d0c622b1de33cf7047f099795b4c780b9

Replace grafana home dashboard with file in node_custom_config folder.

Change-Id: I00e3963ee287c526935e34169b63b1a40e6b4025

grafana_ini file used in test condition doesn't exists,
use grafana_conf file instead.

Change-Id: Id5dca94aed98b0d6cf6c4f841e7380f8b8154416
Closes-Bug: #1673932

Change-Id: I672d6fea935cbe7416ebd0cfff5006fddb9cd534
Partially-implements: blueprint better-reconfigure