Rename kafka to kafka2 (fixes #4)

[maoe]

Pull Request Checklist

This PR is a bug fix for #4.

General

• Update Changelog following the conventions laid out here

• Update README with any necessary configuration snippets: N/A

• Binstubs are created if needed: N/A

• RuboCop passes

• Existing tests pass

Purpose

check-kafka-ping and metrics-kafka-http are broken because they still require 'sense-plugins-kafka' and include CommonKafkaalthough the file/module were renamed tosensu-plugins-kafka2andCommonKafka2` respectively. This PR fixes it.

Known Compatibility Issues

No known issues.

[maoe]

RuboCop passes except for Missing magic comment # frozen_string_literal: true in various places.

% bundle exec rake rubocop
Running RuboCop...
Inspecting 15 files
C..CCCCCCC.....

Offenses:

Gemfile:1:1: C: Missing magic comment # frozen_string_literal: true.
source 'https://rubygems.org'
^
lib/sensu-plugins-kafka2.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
require 'sensu-plugins-kafka2/common_kafka'
^
lib/sensu-plugins-kafka2/common_kafka.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
module CommonKafka2
^
lib/sensu-plugins-kafka2/version.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
module SensuPluginsKafka2
^
bin/check-topics-name.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
#! /usr/bin/env ruby
^
bin/check-kafka-ping.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
#! /usr/bin/env ruby
^
bin/check-topic.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
#! /usr/bin/env ruby
^
bin/metrics-kafka-http.rb:1:1: C: Missing magic comment # frozen_string_literal: true.
#! /usr/bin/env ruby
^

15 files inspected, 8 offenses detected
RuboCop failed!