Remove deprecated hawkular provider sources

[agrare]

The Hawkular provider is deprecated and supporting models have been removed from ManageIQ master.

[miq-bot]

Checked commit https://github.com/agrare/manageiq-providers-hawkular/commit/56c45d5d76b5632e5cbbea8869f2bdd87ca623c5 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0 95 files checked, 2 offenses detected

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• [ ] :bomb: :boom: :fire: :fire_engine: - Linter/Rubocop - missing config files
• [ ] :bomb: :boom: :fire: :fire_engine: - Linter/Yaml - missing config files