Add the mock transport to train-core

[jquick]

Signed-off-by: Jared Quick jquick@chef.io

We need to add mock to the train-core so inspec check and other things that rely on mock work as expected. Before and after testing:

jquick@Jareds-MBP:~/Chef/inspec/_test
(master)> inspec check long_commands
/Users/jquick/.gem/ruby/2.4.3/gems/train-core-1.4.11/lib/train.rb:47:in `rescue in load_transport': Can't find train plugin "mock". Please install it first. (Train::UserError)
        from /Users/jquick/.gem/ruby/2.4.3/gems/train-core-1.4.11/lib/train.rb:39:in `load_transport'
        from /Users/jquick/.gem/ruby/2.4.3/gems/train-core-1.4.11/lib/train.rb:20:in `create'
        from /Users/jquick/.gem/ruby/2.4.3/gems/inspec-core-2.2.10/lib/inspec/backend.rb:46:in `create'
        from /Users/jquick/.gem/ruby/2.4.3/gems/inspec-core-2.2.10/lib/inspec/cli.rb:71:in `check'
        from /Users/jquick/.gem/ruby/2.4.3/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from /Users/jquick/.gem/ruby/2.4.3/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from /Users/jquick/.gem/ruby/2.4.3/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
        from /Users/jquick/.gem/ruby/2.4.3/gems/thor-0.20.0/lib/thor/base.rb:466:in `start'
        from /Users/jquick/.gem/ruby/2.4.3/gems/inspec-core-2.2.10/bin/inspec:12:in `<top (required)>'
        from /Users/jquick/.gem/ruby/2.4.3/bin/inspec:23:in `load'
        from /Users/jquick/.gem/ruby/2.4.3/bin/inspec:23:in `<main>'

jquick@Jareds-MBP:~/Chef/inspec/_test
(master)> inspec check long_commands
Location:    long_commands
Profile:     long_commands
Controls:    7
Timestamp:   2018-06-14T09:21:47-04:00
Valid:       true

No errors or warnings

[clintoncwolfe]

thanks @jquick !