Upscaling OpenShift application nodes (#571)

* scale-up: playbook for upscaling app nodes

* scale-up: removed debug

* scale-up: made suggested changes

* scale-up: indentation fix

* upscaling: process split into two playbooks that are executed by a bash script

- upscaling_run.sh: bash script, usage displayed using -h parameter
- upscaling_pre-tasks: check that new value is higher, change inventory variable
- upscaling_scale-up: rerun provisioning and installation, verify change

* upscaling_run: fixed openshift-ansible-contrib directory name

* upscaling_run: inventory can be entered as relative path

* upscaling_scale-up: fixed formatting

* upscaling: minor changes

* upscaling: moved to .../provisioning/openstack directory, README updated, minor changes made

* README: minor changes

* README: formatting

* uspcaling: minor fix

* upscaling: fix

* upscaling: added customisations, fixes

- openshift-ansible-contrib and openshift-ansible paths are customisable
- fixed implicit incrementation by 1

* upscaling: fixes

* upscaling: fixes

* upscaling: another fix

* upscaling: another fix

* upscaling: fix

* upscaling: back to a single playbook, README updated

* minor fix

* pre_tasks: added labels for autoscaling

* scale-up: fixes

* scale-up: fixed host variables, post-verification is only based on labels

* scale-up: added openshift-ansible path customisation

- path has to be absolute, cannot contain '/' at the end

* scale-up: fix

* scale-up: debug removed

* README: added docs on openshift_ansible_dir, note about bastion

* static_inventory: newly added nodes are added to new_nodes group

- note: re-running provisioning fails when trying to install docker

* removing new line

* scale-up: running byo/config.yml or scaleup.yml based on the situation

- (whether there is an existing deployment or not)

* openstack.yml: indentation fix

* added refresh inventory

* upscaling: new_nodes only contains new does, it is not used during the first deployment

* static_inventory: make sure that new nodes end up only in their new_nodes group

* bug fixes

* another fix

* fixed condition

* scale-up, static_inventory role: all app node data gathered before provisioning

* upscaling: bug fixes

* upscaling: another fixes

* fixes

* upscaling: fix

* upscaling: fix

* upscaling: another logic fix

* bug fix for non-scaling deployments

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