def init
      ENV["GEM_HOME"] = Common.install_dir
      Gem.paths = ENV
      Common.use_dummy_ui unless Kontena.debug?
      plugins
      true
    end
def init
      ENV["GEM_HOME"] = Common.install_dir
      Gem.paths = ENV
      Common.use_dummy_ui unless Kontena.debug?
      plugins
      true
    end
Initialize plugin manager