noheat: Upgrades, refactor, deploy Devstack

noheat: Upgrades, refactor, deploy Devstack

* Revert "Enable VID" (this reverts commit 2223bfaffa8fe5fb90c578ec71a035f001b9ce22)
* make sure ca-certificates is current
* add ability to configure Docker daemon
* upgrade Ubuntu to 20.04
* update tools, dependencies, Ansible Galaxy collections, Docker, RKE, k8s & charts
* make Prometheus & MetalLB optional
* deploy Istio
* use copy instead of ansible.posix.synchronize
* Allow to set IP address pools in OpenStack
* fix ansible-lint issues
* split big tasks files into smaller ones
* migrate to ansible-core
* add 'make onap' task
* add Devstack deployment
* fix NFS exports
* add Strimzi
* install Docker on operator
* override Nexus only on hosts that need it
* ability to set override file (sm-onap is default)
* ability to set ONAP (OOM) branch
* ability to set Devstack version
* add playbook to deploy everything
* describe how to run playbooks
* save operator0 access information
* install Galaxy deps with dedicated module

Issue-ID: INT-1601
Signed-off-by: Maciej Wereski <m.wereski@partner.samsung.com>
Change-Id: I88cfeeaf281c175340b63909983251ecd62eeb00