Add Openstack Panko Events support

[aufi]

Openstack Panko service is about to take over Events login from Ceilometer.
Adding support for Panko service with fallback to Ceilometer for Events capture.
Panko API is identical to Events-related Ceilometer part of API.

It should be possible select Events service also manually in settings.

Depends on fog-openstack PR [1] merge and new version published and [2].

Links

• https://bugzilla.redhat.com/show_bug.cgi?id=1432884
• Add Panko Event service fog/fog-openstack#269 MERGED and released (fog support)
• Add :event_catcher_openstack_service setting manageiq#13985 MERGED (settings.yml option)

[aufi]

fog/fog-openstack#269 was merged, waiting for its release to update gemspec with new fog-openstack version.

[miq-bot]

Checked commit aufi@e79508b with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
4 files checked, 1 offense detected

lib/gems/pending/openstack/openstack_handle/handle.rb

• ❗ - Line 313, Col 5 - Style/Alias - Use alias instead of alias_method in a class body.

[aufi]

Required PRs were merged, updating this PR and removing WIP label.

@miq-bot rm_label wip

[aufi]

@blomquisg @Ladas Hi, may I ask for review?

[aufi]

@miq-bot add_label enhancement

[Ladas]

looks great 👍

[tzumainn]

@miq-bot add_label euwe/yes

[aufi]

Required by https://bugzilla.redhat.com/show_bug.cgi?id=1436340
@miq-bot add_label blocker

[simaishi]

@aufi There are a couple of conflicts backporting this to Euwe. Can you create an Euwe PR for this?

[aufi]

@simaishi Sure, euwe backport: ManageIQ/manageiq#14557

[simaishi]

Backported to Euwe via ManageIQ/manageiq#14557