Rabbitmq checks do not work against Rabbitmq 3.7.x

[jshrack-ssi]

Rabbitmq checks do not appear to be working with Rabbitmq 3.7x versions. Instead of the expected output a varying range of errors are output. Most noteable are:

Check failed to run: can't modify frozen String, ["/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:315:in build_option_arguments'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:269:in block (2 levels) in opt_parser'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:268:in each'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:268:in block in opt_parser'", "/opt/sensu/embedded/lib/ruby/2.4.0/optparse.rb:1062:in initialize'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:263:in new'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:263:in opt_parser'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/mixlib-cli-1.7.0/lib/mixlib/cli.rb:230:in parse_options'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/sensu-plugin-1.4.5/lib/sensu-plugin/cli.rb:13:in initialize'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/sensu-plugin-1.4.5/lib/sensu-plugin/cli.rb:57:in new'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/sensu-plugin-1.4.5/lib/sensu-plugin/cli.rb:57:in `block in '"]